Watch CNN's Dana Bash run down Wednesday's Republican debate and take a look at its most heated moments. (Photo Credit: AP)

Watch voters weigh in on the most heated moments of the debate.

(CNN) – The four remaining Republican presidential candidates got down to the heart of the issues in Wednesday night’s CNN/LATimes/Politico debate moderated by Anderson Cooper.

A dozen undecided male and female Republican voters weighed in on the candidates' responses as the debate progressed.

The red line graph across the screen represents voter’s approval or disapproval of the candidates’ responses.

People meter: Watch Romney and McCain argue their conservative records

People meter: Watch the candidates compare themselves to Ronald Reagan

–CNN's Emily Sherman

WASHINGTON (CNN) - Many of the Democratic members of Congress convening for President Bush's final State of the Union address tonight have already weighed in on his replacement.

Of the Democratic congressional endorsements, Sen. Hillary Clinton of New York leads the remaining candidates competing for their party's nomination with 79 viable endorsements. Sen. Barack Obama of Illinois is in second with 59, and former Sen. John Edwards of North Carolina follows with 16.

Democratic congressional endorsements play an important role in a candidate's ability to secure the party's nomination, beyond any influence they might have with voters. Each Democratic member of Congress gets one vote at the party’s national convention in Denver this August, where the official nominee is elected. These are “superdelegate” votes - independent of their home state's primary or caucus outcomes, which result in the distribution of “pledged” delegates.

To win the nomination, a candidate needs 2,025 of the 4,049 available votes at the convention. There are 286 Democratic members of Congress, including territories. Of those, only 268– about 7 percent of the total convention vote - will have a vote at this year’s convention, because Florida and Michigan have lost their seats due to violations of Democratic Party primary scheduling rules.

Though there is usually a presumptive nominee by each party's conventions at the end of the summer, it’s possible the tight races between the candidates might come down to delegate counts this year.

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[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/01/27/election.democrats/art.election.democrats.afp.gi.jpg caption=" Hillary Clinton, from left, John Edwards and Barack Obama have different takes on the primary message.."](CNN) - Sen. Barack Obama sought Sunday to use his South Carolina victory to expand his appeal, saying the first Southern primary reflects what Americans are looking for.

Speaking to ABC's "This Week," Obama argued that the result in South Carolina "speaks extraordinarily well, not just for folks in the South, but all across the country. I think people want change."

But Sen. Hillary Clinton noted that both she and her top Democratic rival "have won a primary and a caucus."

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The Republican presidential candidates squared off Thursday night. (Photo Credit: AP)

(CNN) - It was largely a cordial affair during Thursday's presidential debate. The best political team breaks it down.