Beto O'Rourke visits Iowa after announcing 2020 run for US president

Among Democrats, the former congressman, who lost a Texas Senate race and has no signature issue or proposal, has his doubters, but he's undeterred.
2:43 | 03/14/19

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Transcript for Beto O'Rourke visits Iowa after announcing 2020 run for US president
the race for 2020. Beto O'rourke, announcing he is in. And right here, our interview with him. And president trump's response. ABC's Paula Farris is in Iowa. Reporter: He's sat down with Oprah, posed for "Vanity fair." But today, for the first time ever, Beto O'rourke came here to Iowa to talk to voters. Hey, everybody. What's up? Reporter: The former congressman, swarmed with cameras. Just hours earlier, he'd announced his presidential campaign, his wife, Amy, by his side. This is a defining moment of truth for this country, and for every single one of us. Reporter: O'rourke burst on to the national scene last year with his vigorous challenge to senator Ted Cruz. Electrifying massive crowds. Sharing his life on Instagram, at times, perhaps, oversharing. I'm here at the dentist. Reporter: Still, his supporters are confident his energy can lift him even higher. Any single Democrat running today, and I may not be able to enumerate every one of them now, would be far better than the current occupant of the white house. Reporter: O'rourke has vowed to run a positive campaign. Can hope, change and unity beat trump? Or do you have to be a street fighter? I think you have to believe in the genius of this country. And the only way to call that forth is to bring everyone in and shut no one out. Reporter: At the white house, the president already taking aim. Well, I think he has a lot of hand movement. I've never seen so much hand movement. Is he crazy? Or is that just the way he acts? Reporter: Among Democrats, O'rourke has his doubters, too. He did lose that senate race, after all. His six years in congress, largely unremarkable. I asked what sets him apart from the pack. I want to be able to bring people together. We've had a history of being able to do that in El Paso, and in Texas. Ensuring the party affiliation or geography or race, doesn't separate us. All right. Paula Farris, you've interviewed him before. Great to see the interview again tonight. You're in Iowa, I know. We've seen polls here of Iowa voters. Joe Biden leads the pack and not running yet. Bernie Sanders close behind. O'rourke down the list. It would appear he has work to do there. Reporter: He does. The people we spoke with today, the savvy Iowa voters most of them Democrats, tell me they're curious to hear more about Beto and find where he stands on the big issues. They say, at the end of the day, they're going to vote for the candidate who has the best chance to defeat president trump. David? Can't believe we're in Iowa already. Paula Farris, thank you. There's more ahead on "World

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

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