(CNN) - Voters in Illinois delivered a decisive win for Mitt Romney in the state's Republican presidential primary. Former Massachusetts Gov. Romney and the three other Republican presidential candidates, former Sen. Rick Santorum of Pennsylvania, former House Speaker Newt Gingrich and Rep. Ron Paul of Texas battled for 54 delegates in the Land of Lincoln.
10:37 p.m. ET - @RickSantorum: Thank you to our supporters in Illinois. We’re taking this fight for freedom next to Louisiana. ht.ly/9MoX4
10:03 p.m. ET - With 56% of precincts reporting, Romney received 47% of the vote to Santorum's 35%, Paul's 9% and Gingrich's 8%.
10:00 p.m. ET - Was Tuesday night a tipping point for the other candidates to drop out of the race?
"There is no deus ex machina that is going to change the math of the race," Romney adviser Eric Fehrnstrom told @piersmorgan, before adding Romney is ahead in the delegate count because he is ahead in the popular vote.
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9:57 p.m. ET - @AriFleischer: If S hadn't gone so far on contraception, snobs, & Obama's false theology, & if he had a better AZ debate, this race wld b closer
9:55 p.m. ET - @jimacostacnn: Santorum says he'll pick up a whole "boat load of delegates" in PA and then it's "on to victory."
9:53 p.m. ET - @MittRomney: Thank you, IL! We've taken one more step toward restoring the promise of America, and tomorrow we wake up & start again.
9:52 p.m. ET - @AriFleischer: Santo's message is I'm the real deal, warts and all. Romney's is I'm a fixer and I can win. So far, R voters prefer Romney.
9:51 p.m. ET - Santorum said he is feeling "very very good about winning Louisiana on Saturday."
"Five days to a big win and a big delegate surge," he said.
9:48 p.m. ET - @jimacostacnn: Santorum: "Obamacare, Romneycare. They're interchangable."
9:47 p.m. ET - @newtgingrich: Low turnout tonight. A nominee that depresses turnout won't beat @BarackObama. Still time for a conservative. Join us: bit.ly/GEOGTa
9:46 p.m. ET - @jimacostacnn: Santorum: “We need someone who’s going to pull government up by the roots and throw it out." #Gettysburg
9:44 p.m. ET - Santorum, referencing the emphasis Romney put on "freedom" during his Tuesday night address, said "I'm glad we are moving the debate here in the Republican Party."
9:40 p.m. ET - Santorum, in remarks to supporters in Gettysburg, Pennsylvania, said he will win downstate, central and western Illinois, areas "conservatives and Republicans populate."
"Happy about the delegates we're going to get too," Santorum said.
9:38 p.m. ET - @CrowleyCNN: Lots of new material in Romney speech drawing contrast w/ POTUS. Businessman v professor. General election speech
9:32 p.m. ET - @jimacostacnn: Santorum speaking to overflow crowd in hallway outside ballroom.
9:29 p.m. ET - The election in November will not be about "party or personality," but will center around "principle," Romney told supporters.
"Our economic freedom will be on the ballot," he said.
9:27 p.m. ET - @PeterHambyCNN: Romney is reprising a lot of the language from yesterday's University of Chicago speech
9:26 p.m. ET - Romney said the American economy will change when the U.S. replaces a "law professor with a conservative businessman."
9:26 p.m. ET - @EWErickson: Most jovial Romney speech.
9:22 p.m. ET - Romney, addressing supporters in Schaumburg, Illinois, said the president "doesn't understand the genius of America's economy," something he said can't be learned from serving as a law professor or as a community organizer.
9:21 p.m. ET - @crowleyCNN: Mitt. "It's time to say this word 'enough.'" (For clarification, he's talking about Obama era.)
9:19 p.m. ET - @David_Gergen: End of debates helping Romney - he isn't seen as pandering as much to hard right. Can stick more to jobs and deficits. #CNNElections
9:14 p.m. ET - @newtgingrich released a statement following the results in Illinois:
"To defeat Barack Obama, Republicans can't nominate a candidate who relies on outspending his opponents 7-1. Instead, we need a nominee who offers powerful solutions that hold the president accountable for his failures. Over the past few weeks, my $2.50 gas plan has shown how America could have cheaper gas, more jobs and greater national security while putting the White House on the defense over their anti-American energy policies. This is the type of leadership I can offer as the nominee, and this campaign will spend between now and when the delegates vote in Tampa relentlessly taking the fight to President Obama to make this case."
8:54 p.m. ET - With 17% of precincts reporting, Romney received 56% support among Illinois voters, followed by Santorum's 27%, Paul's 9% and Gingrich's 7%.
8:44 p.m. ET - Romney spokesperson Andrea Saul told @andersoncooper fundriaing is "part of the game," but pointed to 150,000 donors who contributed less than $180 and are "putting their money where their mouth is."
8:42 p.m. ET - @jimacostacnn: Boos and hisses at Santorum HQ in Gettysburg as CNN projects Romney to win IL.
8:41 p.m. ET - Romney won the Illinois primary, CNN projected based on exit polling and early vote totals.
8:38 p.m. ET - @David_Gergen: If Newt wins less than 10% and Santorum still loses big tonite, Romney greatly solidifies his role as frontrunner. #CNNElections
8:28 p.m. ET - With 1% of precincts reporting, Romney received 54% support, followed by Santorum's 29%, Paul's 10% and Gingrich's 6%.
8:25 p.m. ET - @David_Gergen: A 10 point Romney win tonite would be big. Let's see if the exits hold up in Illinois ( they didn't in MISS). # CNNelections
8:23 p.m. ET - @tromney: Tomorrow is my 42nd bday. And my parents' 43rd anniversary! A win in IL would be a great way to kick it off.
8:21 p.m. ET - @LisaDCNN: While we wait: Am I the only one who thinks this"Illinois-must win" business for Romney is overstatement?. It's a slog either way.
8:19 p.m. ET - Santorum spokesperson Alice Stewart told @andersoncooper she's confident the campaign is "going to get anywhere from two dozen to 30 delegates" in the Illinois primary. She also reiterated the campaign's decision to remain in the race until one of the candidates captures 1,144 delegates and the GOP nomination.
8:17 p.m. ET - @HowardKurtz: Only remaining drama is whether the media can turn an Illinois win into a Mitt setback...
8:07 p.m. ET - Santorum adviser John Brabender told @jimacostacnn Team Santorum expects Romney to do well in "moderate" Chicago counties ... like he did in Massachusetts.
8:00 p.m. ET - According to early CNN exit polling, 45% of Illinois voters supported Romney, followed by 35% for Santorum, 12% for Gingrich and 8% for Paul.
7:55 p.m. ET - @jimacostacnn: No music here at Santorum HQ in Gettysburg. But really hoping for something out of the Ken Burns collection.
7:53 p.m. ET - @crowleyCNN: Sitting in suburban Chicago hotel ballroom waiting for Illinois polls 2 close and "Still The Same" is playing & I'm thinkin "exactly"
7:45 p.m. ET - Of those who considered themselves very conservative in Illinois, 48% supported Santorum, compared to 34% for Romney, 13% for Gingrich and 5% for Paul, according to CNN exit polling. Among self-described moderate or liberal voters, Romney received 47%, followed by 27% for Santorum, 12% for Paul and 11% for Gingrich, according to CNN exit polling.
7:43 p.m. ET - Among Illinois voters who made $100,000 per year or more, 55% supported Romney, 28% supported Santorum, 10% supported Gingrich and 6% supported Paul, according to CNN exit polling.
7:22 p.m. ET - Republican Rep. Paul Ryan of Wisconsin told @ErinBurnett the Republican presidential candidates have not approached him to fill the No. 2 spot on the ticket.
"They've got to win these primaries before they can think about this stuff," Ryan said.
7:21 p.m. ET - @jimacostacnn: On those freedom banners... Santorum accused Romney of abandoning freedom over health care just yesterday. Tonight's theme emerges?
7:06 p.m. ET - @PeterHambyCNN: lead political story on Chicago's ABC7 News opens with this: "When it comes to paper ballots, size matters."
7:04 p.m. ET - Of voters Illinois' urban areas, 45% supported Romney, 23% supported Santorum and 13% supported Gingrich, according to CNN exit polling.
6:47 p.m. ET - Kellyanne Conway, a Gingrich supporter, said a contested convention is possible. After a campaign meeting Monday, Conway said Gingrich thinks the 2012 campaign is a 2-person race between Gingrich and President Barack Obama, while Santorum and Romney debate each other.
"Newt is engaging the president," Conway said, adding that the former House speaker is "elevating this to a national conversation on the way to Tampa."
6:46 p.m. ET - Santorum spokesperson Hogan Gidley, on @JohnKingUSA said "we think we have a chance" to reach 1,144 delegates, adding that he has "confidence we're going to do that."
6:18 p.m. ET - Romney backer and Virginia Gov. Bob McDonnell, when asked by @JohnKingCNN about a vice presidential run, said "nobody cares about V.P. ... we're trying to find a nominee."
5:45 p.m. ET - Bachmann: GOP needs to 'unify quickly'
5:37 p.m. ET - Forty percent of those polled from CNN exit polling in Illinois said the economy is getting worse, while 36% said it is staying the same and 19% said it is recovering. Thirty-seven percent considered themselves somewhat conservative, while 35% said they were moderate or liberal and 28% said they were very conservative, according to early CNN exit polling.
5:34 p.m. ET - Seventy-one percent of Illinois voters Tuesday were from suburban areas, compared to 18% from urban areas and 11% from rural areas, according to CNN exit polling. The same polling found the economy was the most important issue facing the country for 39% of those polled. Twenty-six percent said the budget deficit, 19% said abortion and 11% said illegal immigration.
4:36 p.m. ET - @crowleyCNN: So in sunny, record breaking 80+ degree Chicago, Election Board reports "disappointing" morning turnout.
4:25 p.m. ET - @crowleyCNN: "All my life's a circle". The Illinois Chapter twitpic.com/8z1tev
2:00 p.m. ET - Boone and Rock Island Counties also reported problems with the size of their ballots. The issue was discovered shortly after the polls opened in Boone County around 7:30 a.m. and were resolved within the hour, the clerk's office said. Ballots from Rock Island County were a "a hare too big," according to Rock Island County Clerk Karen Kinney. She said replacement ballots were subsequently printed all voters were able to vote.
1:30 p.m. ET - Republican Sen. John McCain of Arizona won the 2008 Republican primary in Illinois with 47.5% of the vote to Romney's 28.6%, former Arkansas Gov. Mike Huckabee's 16.5% and Paul's 5%.
1:08 p.m. ET - Some of the ballots printed in Winnebag County, Illinois were too big for the vote counting machines, the county clerk's office announced. The issue will not affect voters but machine will be unable to count those ballots. However, all ballots will be counted and tabulated.
"The Office of the County Clerk wants to assure the citizens of Winnebago County that each and every vote will be properly counted," Winnebago County Clerk Margie Mullins said in a statement.
Where the delegates stand (pre-Illinois results):
- 1,144 delegates needed to clinch the GOP nomination
- 2,286 total delegates
- 996 delegates so far
- 1,290 delegates remaining
- Romney needs 624 delegates to clinch the nomination (48% of the delegates remaining)
- Santorum needs 905 delegates to clinch the nomination (70% of the delegates remaining)
- Gingrich needs 1,006 delegates to clinch the nomination (78% of the delegates remaining)
- Paul needs 1,075 delegates to clinch the nomination (83% of the delegates remaining)
- Romney has 45% of the delegates needed to clinch
- Santorum has 21% of the delegates needed to clinch
- Gingrich 12% of the delegates needed to clinch
- Paul 6% of the delegates needed to clinch
Nuts and bolts:
– Polls open: 7 a.m. to 8 p.m.
– Open primary
– Delegates at stake: 54
– Allocation rule: Proportional
– Illinois registered voters (as of 1/25/12): 8,272,219