Bernie Sanders, Elizabeth Warren vie for top spot

The 2020 Democratic candidates have jostled for the lead position ahead of the next high-stakes debate as Sen. Cory Booker announced he will drop out of the race.
2:07 | 01/14/20

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Transcript for Bernie Sanders, Elizabeth Warren vie for top spot
The race for the white house now and tonight's final democratic debate before the first votes in Iowa. Senator Cory booker, the latest Democrat to drop out is as the remaining candidates prepare for heated clarns tonight. Linsey Davis is on the scene. We're alreadying seeing a skirmish between Bernie Sanders and Elizabeth Warren. Reporter: We certainly are, good morning to you, George. The story line here is interesting. Not so much a he said/she staid as his campaign says one thing and hers says another. The national front-runner is still Joe Biden according to a national poll but many are on Sanders and Warren and a growing rift. The stage set for a fiery debate here in Iowa as tensions rise between senators Elizabeth Warren and Bernie Sanders. The campaigns now duking it out over a private conversation in 2018 when Sanders allegedly told Warren a woman can't win. Warren saying in a statement, among the topics that came up was what would happen if Democrats nominated a female candidate. I thought a woman would win. He disagrees. Sanders denied the claims calling it ludicrous stating do I believe a woman can win in 2020? Of course, after all Hillary Clinton beat Donald Trump by 3 million votes in 2016 and the Warren campaign taking issue that Sanders volunteers are slamming her as a candidate of the elite unable to expand the democratic base. Despite a recent poll showing Sanders surging to the top in Iowa, a new quinnipiac poll suggests nationally the candidate to beat is still Joe Biden. Also of note from that quinnipiac poll of the 35% of the people, people who responded said that they have made up their minds. The rest are still undecided about who they will vote for. While there is a lot of focus on Warren and Sanders, remember, the total six candidates on the stage here tonight at drake university, George, get the popcorn ready. The candidates have to be careful. Iowa voters have a history of punishing those who get into fights before the caucus. Now to the fallout grow interesting that world series

This transcript has been automatically generated and may not be 100% accurate.

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