(CNN) - Voters in four states cast ballot Tuesday for the Republican presidential nomination, with Rick Santorum winning the largest contests in Alabama and Mississippi. The four Republican presidential candidates, former Massachusetts Gov. Mitt Romney, former Sen. Santorum of Pennsylvania, former House Speaker Newt Gingrich and Rep. Ron Paul of Texas battled for 110 total delegates in Alabama, Mississippi, Hawaii and American Samoa.
11:51 p.m. ET - @crowleyCNN: Mothership is full of chatter that GOP headed for brokered convention. I'm not there yet.
11:50 p.m. ET - @PeterHambyCNN: Newt adviser floats me idea of a Santorum-Gingrich ticket: "Newt Gingrich and Rick Santorum would be a powerful team against Barack Obama."
11:48 p.m. ET - @stevebruskCNN: Latest CNN delegate estimate: Romney 480, Santorum 234, Gingrich 139, Paul 66
11:40 p.m. ET - @DWSTweets: Wasn’t for a lack of trying—Romney had a huge spending advantage over his rivals, which he used to carpet-bomb them with negative ads.
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11:39 p.m. ET - @PrestonCNN: Santorum's new fundraising email: "we did it again." & he implies Romney's advisers are liberal, calling them "Boston consultants."
11:37 p.m. ET - @stevebruskCNN: Romney statement congratulates Santorum, tries to play up "we will be increasing our delegate count in a very substantial way"
11:29 p.m. ET - @PeterHambyCNN: Rankin County turnout in 2011 Gov Primary: Roughly 30,000. Turnout tonight: Roughly 20,000.
11:20 p.m. ET - @JohnAvlon: Can we all agree now that this ain't over and won't be for a long time?
11:15 p.m. ET - Santorum spokesperson Hogan Gidley, on CNN, said Gingrich has "every right to stay in the race." But if Gingrich were not in the race, Santorum would be beating Romney and "beating him badly."
11:12 p.m. ET - @LisaDCNN: GINGRICH: ."..after the primaries r over, it will b obvious the...frontrunner didn't get there.... and we'll be in a whole new conversation"
11:08 p.m. ET - @AriFleischer: Newt can light up a GOP crowd &he makes good points. But Rs aren't/won't voting 4him. Rs like him, but want him 2do something else.
11:07 p.m. ET - Gingrich said he hopes Tuesday's results will end "any news media talk" about Romney as the inevitable candidate. When the primaries are over and Romney has not garnered enough delegates, Gingrich said it will be "clear" he is the best Republican to be Obama in the general election.
11:01 p.m. ET - @JohnKingCNN: @newtgingrich vows in til convention, attacks @MittRomney. The @RickSantorum #s on left have 2 hurt yfrog.com/mo1ulnvj
11:00 p.m. ET - Gingrich said he has already changed the dialogue of the campaign with his focus on energy, something he said Romney has failed to do. He pointed to criticism from the White House about his promise to reduce gas prices to $2.50 per gallon as evidence of the conversation shift.
10:58 p.m. ET - Gingrich, addressing supporters in Birmingham, Alabama, congratulated Santorum on a "great campaign." But he also said his campaign will receive a "substantial number of delegates going toward Tampa," following Tuesday's contests.
10:55 p.m. ET - On CNN, Gingrich Deputy Campaign Manager Vince Haley predicted a "three way dynamic" between Romney, Santorum and Gingrich "all the way to this convention." He said no candidate will be able to capture the nomination before Tampa.
10:50 p.m. ET - @EWErickson: Every time the Romney team lets expectations get away from them, they underperform.
10:49 p.m. ET - Santorum won the Mississippi primary, CNN projected.
10:43 p.m. ET - @JohnKingCNN: Almost impossible for @RickSantorum to lose this lead. Which means likely southern sweep 2 nite. #CNNelections pic.twitter.com/OagfP2HM
10:41 p.m. ET - Santorum predicted a huge win in Louisiana and said "we will compete everywhere," including Puerto Rico, where he will head Tuesday night.
10:40 p.m. ET - @alexcast: i have thought O will drive big gop turnout in fall: nothing unites people of earth like threat from mars. but low turnout now is worrisome
10:36 p.m. ET - @jimacostacnn: Santorum: "I don't think there was a single poll that had me close to winning Mississippi."
10:35 p.m. ET - Santorum thanked his eldest daughter Elizabeth who is in Hawaii on behalf of the campaign.
"Thank you sweetie for the sacrifice," he said with a wink.
10:32 p.m. ET - Santorum opened his remarks to supporters in Lafayette, Louisiana saying "We did it again."
10:27 p.m. ET - Eric Fehrnstrom, a senior adviser to the Romney campaign, said Team Romney did not expect to win in Alabama or Mississippi, but wanted to capture a third of the delegates from the states, something he said they will achieve. He also continued the Romney campaign line that it is a "virtual impossibility" for Santorum to achieve the delegates necessary to capture the nomination.
10:25 p.m. ET - @EWErickson: The argument that Gingrich needs to get out b/c he is hurting Santorum no longer holds water. Newt's impact is fading.
10:20 p.m. ET - @alexcast: bad night for Gingrich. stock tip: sell Tiffany's stock short soon as market opens.
10:19 p.m. ET - Robert Gibbs, a senior adviser to the president's re-election campaign, said Tuesday was "shaping up to be a remarkable night for Rick Santorum."
"I think it's a pretty bad night for Mitt Romney and certainly not a great night by any means for Newt Gingirch," the former White House press secretary said on CNN.
Gibbs, an Alabama native, said Gingrich "has a tough time not having won in a state that touches his home state."
10:18 p.m. ET - @JohnKingCNN: If we end the night w/MS&AL @RickSantorum purple, @MittRomney & @newtgingrich will be weakened. yfrog.com/o06wuyqj
10:16 p.m. ET - Santorum won the Alabama primary, CNN projected.
10:14 p.m. ET - In response to Romney's earlier comment on CNN that Santorum is at the "desperate end" of his campaign, Santorum spokesperson Hogan Gidley told CNN Chief Political Analyst Gloria Borger: "It's just the beginning."
10:08 p.m. ET - @PeterHambyCNN reported Henry Barbour, a leading Romney supporter in Mississippi, was close to forecasting defeat Tuesday.
"The trends are discouraging. But there is still a lot out ... But I would say we are underperforming and Santorum outperforming my expectations at this point. Santorum is running stronger than I expected. I am struggling to see where the votes will come from," Barbour told CNN.
He cautioned that some large boxes are still out in Rankin and also griped that turnout is low. Madison, for example, typically delivers 15,000 votes in a GOP primary. There were only a few thousand there Tuesday.
9:57 p.m. ET - @alexcast: So this will now be 2 man race, santo vs mitt, when it is too late for santo to win. Great. Just what GOP needs.
9:50 p.m. ET - @jimacostacnn: Santorum's Gidley on the numbers right now: "cautiously optimistic."
9:49 p.m. ET - With 68% of precincts reporting in Mississippi, Santorum received 33% support, followed by Gingrich's 31%, Romney's 30% and Paul's 4%.
With 25% of precincts reporting in Alabama, Santorum received 34% support, followed by Gingrich's 30%, Romney's 28% and Paul's 5%.
9:44 p.m. ET - @alexcast: after high mitt expectations in MS, twin Santo wins would suck wind out of Gingrich, no small feat. painful months ahead for Romney
9:41 p.m. ET - @PeterHambyCNN: Romney's catfish talk? It worked! He won Humphreys County, MS, the Catfish Capital of the World since 1976.
9:38 p.m. ET - @DanaBashCNN: This is the vault where the prisoners are bringing ballots in Jeff county Alabama #cnnelections pic.twitter.com/UzRK6S4s
9:32 p.m. ET - @jimacostacnn: Santorum crowd singing "God Bless America."
9:29 p.m. ET - Now with 32% of precincts reporting in Mississippi ... Santorum on top with 33%, followed by Gingrich at 31%, Romney with 31% and Paul with 5%.
9:19 p.m. ET - With 17% of precincts reporting in Mississippi, Santorum led with 34% support followed by Gingrich with 30%, Romney with 30% and Paul with 5%.
9:16 p.m. ET - @jimacostacnn: Alice Stewart just walked over and told me they are not "formally" calling on Gingrich to get out of the race.
9:13 p.m. ET - @ShanTravisCNN reported unofficial results from Jackson County, Mississippi, with 5 of 31 precincts reporting: Romney: 37.85% with 508 votes, Santorum: 29.73% with 399 votes, Gingrich: 26.83% with 360 votes and Paul: 4.32% with 58 votes.
9:12 p.m. ET - @DanLothianCNN: After basketball bi-lat, Obama and Cameron pose for pics then president grabs a baby for the cliche campaign photo-op
9:10 p.m. ET - @DanaBashCNN: New numbers from inside Jeff county elex center newt 961 romney 1005 santorum 1003. 38 out of 360 machines reporting #CNNElections
8:59 p.m. ET - @LisaDCNN: MISSISIPPI RESULTS: w/ 6% reporting its 32-32 tie b/t Romney and Santorum. Gingrich with 28%.
8:35 p.m. ET - @PrestonCNN: Romney sends out a fundraising email.$5 is the entry fee for a chance to have a hamburger w/him in Calif. Value of contest prize: $1000.
8:33 p.m. ET - @David_Gergen: If Santorum pulls out Alabama AND Miss, definitely a 2-man race w/ R still frontrunner but Sant coming up on outside. #CNNElections
8:24 p.m. ET - @PaulBegala: Wow. Just 3 pts separate 1st from 3rd place in our #CNN MS exit poll. Romney 33 Santorum 30, Gingrich 29. #CNNElections.
8:20 p.m. ET - @Jon2012girls: Eating shrimp and grits and sipping some southern comfort to get through this night. #MSprimary #gop
8:17 p.m. ET - @SamFeistCNN: EXIT POLL UPDATE: Mississippi tightening. Now: Romney 33, Santorum 31, Gingrich 30, Paul 5. Maybe long night. #CNNElections
8:15 p.m. ET - Santorum spokesperson Alice Stewart told @jimacostacnn after Tuesday's contests the Republican contest will be a "two person race."
"Rick and Mitt after this," Stewart said.
She called Romney's comments to @wolfblitzercnn that Santorum is at the "desperate end" of his campaign, "not very nice."
"No southern hospitality with that statement," Stewart said, after saying voters are frustrated with the "out of touch" Romney.
8:10 p.m. ET - Gingrich Chief of Staff Patrick Millsaps told @joejohnscnn there is a "long path to Tampa, and I think you will see us there," referencing the site of the Republican convention in August.
Millsaps said Team Gingrich expects to pick up delegates in Alabama and Mississippi Tuesday. After that ... Louisiana, which holds its primary on March 24, will be "half time."
8:09 p.m. ET - @crowleyCNN: Romney camp wants state win 2nite but will pick up delegates in every state. No Romney event 2nite. I'm @ mothership in Atl. No music
8:08 p.m. ET - @jimacostacnn: Spin watch: If the exits are correct, look for Romney to say I can win in the south. Look for Santorum to say Newt, it's time to go.
8:06 p.m. ET - @HowardKurtz: Wolf: A "significant setback" for Gingrich if he loses both states tonight. That's for sure.
8:03 p.m. ET - Forty-two percent of voters in Mississippi said they consider themselves very conservative, compared with the 27% who said they are somewhat conservative and 30% who said they are moderate or liberal, according to CNN exit polling.
Thirty-eight percent of voters in Alabama considered themselves very conservative, compared with 31% who said they are somewhat conservative and 31% who said they are moderate or liberal, according to CNN exit polling.
8:01 p.m. ET - According to CNN exit polling in Alabama, Santorum received 34% of the vote, followed by Romney with 29%, Gingrich with 28% and Paul with 6%.
CNN exit polling in Mississippi showed Romney in the to spot with 35% support, followed by Gingrich's 30%, Santorum's 29% and Paul's 5%.
7:56 p.m. ET - @DanaBashCNN: something u don't see every day.Inmates will help bring in ballots here in Jeff county alabama #cnnelections pic.twitter.com/1HwxGhkk
7:55 p.m. ET - @jimacostacnn: Santorum campaign internals show they are leading in AL. They see a southern split as a good night for them. #CNNElections
7:53 p.m. ET - @LisaDCNN: ELECTION NIGHT: get your snacks and beverages. Polls about to close in MS, AL. I'm kicking off my shoes getting ready to report and tweet.
7:52 p.m. ET - @adamplevycnn: Romney's total delegate estimate is 459. Tonight could be the night he crosses 500 mark. #CNNElections
7:47 p.m. ET - @JohnKingCNN: The GOP delegate chase as we begin a big night. #cnnelections. yfrog.com/kht91ihhj
7:36 p.m. ET - Thirty-five percent of voters in Alabama were married women, according to CNN exit polling. Of those voters, 40% supported Romney, 36% supported Santorum, 17% backed Gingrich and 6% backed Paul.
Forty-five percent of voters in Mississippi were married women, according to CNN exit polling. Of those voters, 40% backed Romney, 33% supported Santorum, 23% supported Gingrich and 2% backed Paul.
7:22 p.m. ET - @David_Gergen: If R wins one state tonite, pressure on one rival to drop. If R wins two, pressure on both rivals to call a wrap. Join us#CNNElections
7:18 p.m. ET - Former Minnesota Gov. Tim Pawlenty, who backed Romney after suspending his own presidential bid, told @ErinBurnett it looks like Romney could "be tied or very close to the top or even come out on top" in either Mississippi or Alabama, or both states Tuesday.
This could be the "breakthrough moment of this campaign," Pawlenty said on CNN's "OutFront."
"The resilience of Mitt Romney is starting to shine through," he added.
7:11 p.m. ET - @JohnKingCNN: Exits: more than half of voters in Miss. & Ala. say @MittRomney not conservative enough (those voters split btw Gingrich & Santorum)
6:55 p.m. ET - @AdamATCNN: Per WH Pool: At times, Mr. Obama appeared to be explaining aspects of the game to Mr. Cameron as they sat huddled next to each other.
6:44 p.m. ET - @DanLothianCNN: Obama and Cameron sit among students courtside watching first round NCAA action
6:33 p.m. ET - @DanaBashCNN: another tid bit from alabama-long time rep spencer bachus facing primary challenge from tea party right. also could drive up santorum voters
6:32 p.m. ET - @DanaBashCNN: overlooked in alabama? roy moore of 10 commandments fame is running to be chief justice again. could drive up conservative (santorum) voters
6:21 p.m. ET - Former GOP presidential nominee and Romney supporter McCain told @JohnKingCNN it is possible Romney could win the primaries in Alabama and Mississippi Tuesday, "putting to rest the myth that he can't succeed in southern states."
"But the way, I'm sure it's because he's grown to like grits and other things," McCain said on CNN's "John King, USA" referencing Romney's comments on the trail regarding the southern food staple.
"If he wins both of them tonight, it sends the signal that he can win anywhere," McCain added.
But what about a contested Republican convention? "Not going to happen," McCain said.
6:12 p.m. ET - @EWErickson: My sister in MS says the top local news story is very low turnout.
6:07 p.m. ET - Republican Gov. Robert Bentley of Alabama, who voted for Santorum in his state's primary but did not endorse the candidate, told @JohnKingCNN Romney has the best chance of winning the Republican presidential election, "there is no doubt about that."
"But you should always vote your heart, I think," Bentley said on CNN's "John King, USA."
6:05 p.m. ET - When asked who is best equipped to defeat the president in November, 52% of Mississippi voters said Romney, 24% said Gingrich, 21% said Santorum and 2% said Paul, according to CNN exit polling. Fifty-two percent of voters in the state said Romney's positions were not conservative enough, 34% said they were about right and 9% said they were too conservative.
Forty-six percent of Alabama voters said Romney was best equipped to defeat Obama, 24% said Santorum, 23% said Gingrich and 3% said Paul, according to CNN exit polling. Of those voters, 55% said Romney's positions were not conservative enough, 27% said they were about right and 6% said they were too conservative.
6:03 p.m. ET - When voters in Mississippi were asked what is the most important candidate quality, 42% said their ability to defeat President Barack Obama, 19% said if they are a true conservative, 19% said having a strong moral character and 18% said they have the right experience, according to CNN exit polling.
When voters in Alabama were asked what is the most important candidate quality, 39% said their ability to defeat President Barack Obama, 17% said if they are a true conservative, 22% said having a strong moral character and 17% said they have the right experience, according to CNN exit polling.
5:59 p.m. ET - @JohnKingCNN: Early exits: tight races in Miss. and Ala w/ high number IDing as evangelicals & almost half saying religious beliefs matter a great deal
5:45 p.m. ET - @PeterHambyCNN: the March 25 – May 8 march won't be fun for Newt. DC, MD, WI, CT, PA, RI, NY. on May 8, WVa is best shot. but still only 31 delegates. even though NC is "southern," you gotta think that's good Romney turf.
5:41 p.m. ET - Romney, appearing on CNN's "The Situation Room," said Santorum is at the "desperate end of his campaign," citing his standing in the delegate count and popular vote. He also said and said ads from a super PAC supporting his candidacy are "misrepresenting the truth."
5:40 p.m. ET - When asked about Gingrich's recent comments that the mission in Afghanistan "may not be doable," Romney told @wolfblitzercnn there is "no certainty" in a matter of foreign policy and that prospects should be assessed over time. Referencing the recent shooting in the country, Romney said policy should not be based on the actions of one "crazed, deranged person."
5:33 p.m. ET - When asked how much the religious beliefs of the candidates mattered to Mississippi voters, 45% said a great deal, 32% said somewhat, 12% said not much and 9% said not at all, according to CNN exit polling.
When the same question was asked of Alabama voters, 44% said it mattered a great deal, 30% said it mattered somewhat, 15% said not much and 10% said not at all.
5:30 p.m. ET - Eighty-one percent of Mississippi voters were white Evangelical or born-again Christians, according to CNN exit polling, compared to 19% who were not.
Seventy-three percent of Alabama voters were white Evangelical or born-again Christians, according to CNN exit polling, compared to 27% who were not.
5:07 p.m. ET - @JohnKingCNN: How much closer will @MittRomney get to that "magic number".. Santorum voter @GovernorBentley on how Ala. will change the race tonight 6pE
4:34 p.m. ET - @streitfeldcnn: Lotta people waving to the press bus outside Kansas City as the motorcade rolls to location #iftheyonlyknew
3:50 p.m. ET - McCain captured the Mississippi primary with 79% of the vote in 2008, followed by Huckabee's 13%, Paul's 4% and Romney's 2%. Romney suspended his presidential campaign two days after Mississippi voted, on Super Tuesday.
3:10 p.m. ET - Former Arkansas Gov. Mike Huckabee won the Alabama Republican primary in 2008, a Super Tuesday contest, with 41% of the vote to Arizona Sen. John McCain's 37%, Romney's 18% and Paul's 3%.
2:15 p.m. ET - @PeterHambyCNN: if Romney underperforms tonight, I would be scared about Missouri.
2:00 p.m. ET - @PeterHambyCNN: Curious to see how accurate MS/AL polling has been. Tennessee was a three-way race, until it wasn't.
Nuts and bolts:
– Polls open: 8 a.m. ET to 7 p.m. or 8 p.m. ET
– Open primary
– Delegates at stake: 47
– Allocation rule: Proportional
– Alabama registered voters (as of 1/31/12): 2,977,718
– Polls open: 8 a.m. ET to 8 p.m. ET
– Open primary
– Delegates at stake: 37
– Allocation rule: Proportional
– Mississippi registered voters (as of 3/2/12): 1,851,208
– Polls open: 8 a.m. ET to 2 a.m. ET
– Delegates at stake: 17
– Allocation rule: Proportional
– Hawaii registered voters (as of 10/19/11): 670,000
– Polls open: 11 p.m. ET to 2 a.m. ET
– Delegates at stake: 9