San Antonio Mayor the Next Barack Obama?

Julian Castro follows in Obama's footsteps to give Democratic keynote address.
3:00 | 09/04/12

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Transcript for San Antonio Mayor the Next Barack Obama?
But there's someone else who electrical taking center stage tonight. As a young barack obama proved eight years ago, the keynote is also a star, today, I talked to the mayor of san antonio, julian castro who, by the way, is only 37 years old. How will we know that you're nervous? I can guarantee you I'll be nervous. When I get up there, I'll be ready. And the first hispanic? Yeah, the first hispanic. It feels like a great opportunity. I'm very honored. At the same time, I'm not going to try to live up to folks that are in a different league. The cause endures, the hope still lives, and the dream shall never die. There is not a black america and a white america and latino america, an asiaen america. There's the united states of america. A lot of folks have asked about president obama's 2004 speech, he's a person of unique ability and talent. I'm going to be myself. Like that newcomer, barack obama, castro is a son of a single mo his grand mother immigrated to this country, taught herself english, worked as a maid, not only did julian graduate from harvard law, so did his twin brother joaquin by one minute. Is there any chance that you could ask your brother to substitute four? Just trying the twin thing here? No, I doubt it you know, he's way too good looking. And he's unmarried. He doesn't have a wedding ring. The 37, castro is the youngest mayor of any u.S. City. He's been teased by the president for his boyish looks. Julian castro, the best lo looking -- I'm messing with you. I keep hoping one day when I'm 80 years old, I'll be 40 or something. We asked about that generational challenge of paul ryan's speech. College graduates should not HAVE TO LIVE OUT THEIR 20s IN Their childhood bedrooms, staring up at fading obama posters. If you look at the policy that they embrace, a lot of those young folks won't even make it to college u the policies that governor romney and congressman ryan would embrace. Their future would be limited, you know, working at a job. But how do you convey to them that a second four years will bring more than the first four did for them? Looking as we were as a nation when president obama took office, a nation that's losing 750,000 jobs looking where we are now, with 4.5 million new jobs created, that's more than that was created under the previous administration's eight years. So tonight it is mayor julian castro who walks on to the international stage, by the way, his brother, his best friend and he says his life long champion is going to introduce him to the world. My brother has been the dreamer between the two of us. And so it's just very meaningful for me to get to share the moment with him. Like we've shared everything in our lives together. What is the sentence you most hope people will say after tonight's speech? Opportunity. Really nervous, he says. And ready.

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

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