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Brownback will not run for re-election.

WASHINGTON (CNN) – Sen. Sam Brownback will announce Thursday he is retiring from the Senate when his term ends in 2010, allowing the Kansas Republican to explore a run for governor.

He will be the second GOP senator this year to publicly state he is leaving at the close of the 111th Congress.

Brownback, who unsuccessfully sought the 2008 GOP presidential nomination, will not reveal his future political plans during the three news conferences planned for Thursday in Kansas. But a source close to Brownback said he will file gubernatorial paperwork in January.

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The Kansas senator wins again.

(CNN) - CNN projects that Republican incumbent Pat Roberts will win a third-term in the Senate race in Kansas, defeating Democrat Jim Slatter, a former six-term congressman.

CNN projections are based on actual results and exit poll data from key areas.

Sens. Clinton and Obama remain in a tight race for the Democratic nomination after Saturday's voting.

WASHINGTON (CNN) - Sen. Barack Obama swept Saturday's Democratic contests, giving him considerable momentum heading into Sunday's Maine caucuses and three primaries Tuesday.

John McCain, however, was handed a starkly different message from the GOP, as voters in Louisiana and Kansas indicated they weren't ready to support the Arizona senator. Washington, however, backed the Republican front-runner over former Arkansas Gov. Mike Huckabee, according to state party officials.

McCain's camp congratulated Huckabee on the victories but with an air of confidence, saying that Huckabee threatened only to chip away at McCain's substantial lead in the GOP race for the presidential nomination.

"The reality is that John McCain is the presumptive nominee of our party," said campaign spokesman Brian Rogers. "We'll campaign in these upcoming states as long as Gov. Huckabee is in the race, but our main focus is on uniting the Republican Party for victory in November."

Though CNN calculations estimate that Huckabee would need to snare hundreds more delegates to catch McCain, the Democrats are in a much tighter race.

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(CNN) – Former Arkansas Gov. Mike Huckabee reiterated Saturday night that he will remain in the race for the Republican nomination until someone obtains the 1,191 delegates needed to become the GOP’s presidential nominee.

“People don’t want to be told who their president’s going to be,” Huckabee said when asked by CNN’s Wolf Blitzer to explain his win in the GOP’s caucuses in Kansas Saturday. “And, in the Republican Party, people want to make a choice. They don’t want somebody else making that decision for them,” he added.

“There’s something going on out there, it’s called an election,” Huckabee said. The GOP underdog also told Blitzer that competition is a core principle of the Republican Party.

Related video: Analysis: Huckabee's Kansas win

–CNN Associate Producer Martina Stewart

Mike Huckabee won the GOP caucuses in Kansas Saturday.

WASHINGTON (CNN) - Former Arkansas Gov. Mike Huckabee won the Kansas Republican caucuses Saturday.

With 100 percent of precincts reporting, Huckabee had 60 percent of the vote, compared with 24 percent for Arizona Sen. John McCain and 11 percent for Texas. Rep. Ron Paul.

Huckabee won all 36 of the delegates at stake.

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To track the Kansas caucus results county-by-county, click here: Kansas