Democratic candidates greeted by crowds on eve of Iowa caucus

The voting in the 2020 race is expected to be a four-way battle between Joe Biden, Bernie Sanders, Elizabeth Warren and Pete Buttigieg.
2:44 | 02/03/20

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Transcript for Democratic candidates greeted by crowds on eve of Iowa caucus
or patients. Ian, thank you. And Democrats in their final hours of campaigning in Iowa. Greeted by overflow crowds. Expected to be a four-way race between Biden, Sanders, Warren, and buttigieg. And now a heated battle suddenly erupting between president trump and a candidate who is not even there. Rachel Scott is in Des Moines tonight. Reporter: In Iowa tonight, the frenzy of the final hours. The nail-biting close race is fueling a fight for a strong finish. We are going to beat Donald Trump. Reporter: Today, thousands packing into events across the state. Overflow crowds cramming to get a last peek. How about we cancel student loan debt for 43 million. Reporter: Senator Elizabeth Warren making her last pitch. Some still not sold. I just think that we need to be a little bit more towards the center to defeat trump. Reporter: Warren's Progressive rival, senator Bernie Sanders, is on the rise in the polls. Sanders hoping for a victory in the state he lost four years ago. We win here, we have a path toward victory. And together we will defeat the most dangerous president in modern American history. Reporter: Mayor Pete buttigieg branding himself as the fresh face the party needs. Every single time that my party has won the white house, it's been with a candidate who was new to national politics, opening the door to a new generation focused on the future. Reporter: Vice president Joe Biden taking aim at president trump. We choose unity over division. And we chose truth over lies. Reporter: But the president directing his attacks at billionaire mayor Michael Bloomberg, who has spent more than $300 million on ads and now may qualify for the Nevada debate. The president mocking Bloomberg's height. You know, now he wants a box for the debates to stand on. Okay, it's okay, there's nothing wrong. You can be short. Why should he get a box to stand on, okay? Reporter: The Bloomberg campaign firing back, calling the president a, quote, "Pathological liar who lies about everything. His fake hair, his obesity, and his spray-on tan." I stand twice as tall as he does on the stage, on the stage that matters. Rachel joining us live from Iowa. A poll by the "Des Moines register" was supposed to come out last night, but was pulled at the last minute? Reporter: That's right, Tom. The "Register" learned of a complaint from a buttigieg supporter complaining that he was not listed. This was supposed to be the last state poll ahead of the Iowa caucuses. The decision to pull it is making that race that much harder to read tonight.

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

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