Six candidates are invited to join in the 7th Democratic presidential primary debate

Recent poll indicates Sen. Bernie Sanders may be surging in crowded Democratic field.
2:30 | 01/12/20

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Transcript for Six candidates are invited to join in the 7th Democratic presidential primary debate
2020 race for president with the new poll indicating Bernie Sanders may be surging in the crowded democratic Iowa field. That caucus closing in, just 23 days away. Followed by senator Elizabeth Sanders with 20% among likely caucusgoers, followed by senator Elizabeth Warren, mayor Pete buttigieg and former vice president Biden. The top four candidates clustered in a near tie. Here's Rachel Scott with the latest on the very tight race in Iowa. Reporter: In Iowa tonight, the crowd on its feet for senator Bernie Sanders, surging in that new poll, hoping to do what we couldn't in 2016 -- hoping to come out on top in the caucuses. I'm asking for your support to help me win the democratic nomination. Reporter: Just 23 days out from the first caucus, Iowa locked in a dead heat. 20% say the Vermont senator is their pick. Senator Elizabeth Warren mayor Pete buttigieg and Joe Biden right in it too. In every poll this cycle there's been a different front-runner. Buttigieg down nine points since November. Sanders boosted by his loyal supporters. Building on his base from 2016. I want him to get back in there. I'm hoping this time we can swing it back. Reporter: It's still anyone's contest to win. 45% of the caucusgoers say they could be persuaded to support another candidate. While his candidates are barnstorming, Michael Bloomberg is skipping Iowa entirely. Zeroing in on the super Tuesday strategy. The billionaire campaigning in Texas today with TV's judge Judy. Judge, I am so honored to have you here. I would love to tell you that I watch you all day every day, but I have a few other things to do. Reporter: But his plans to self-fund his own campaign with record ad buys disqualify him from the debate stage leaving others to pitch to the voters. Ads don't vote and $10 million super bowl ads don't vote. People vote. Rachel, you just mentioned the debate in your report. It's just days away. The final debate before the Iowa caucus and it's the smallest stage yet. Reporter: Exactly, Tom. 13 candidates still in the race, only six, though, have qualified. Bloomberg will not be there, but the other billionaire in the race Tom Steyer made the cut at the very last minute. Sharing that stage that night with vice president Joe Biden and Bernie Sanders. Rachel Scott from the campaign trail. Rachel, thanks.

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

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