Transcript for Who Is Julian Castro?
A favorite shampoo commercial once said. You never get a second chance at making -- first impression. Which is why I'm after -- keynote address the Democrats his first chance on a national stage. Offers him an opportunity to sketch out a position of prominence -- head and shoulders. About the -- Who is who -- on Castro. Democrats are sketching a 37 year old as a rising star during his second -- Europe's Antonia. He's also seen as a crucial voice to the Latino vote that is expected to be more than twelve million strong this presidential election. But who is the country's youngest mayor of a major city. Have you seen this guy before. Italy despite interpretation -- -- -- witnesses. If you know who's delivering the keynote address. -- OK what about that guy looked familiar. -- not even remotely. Do you recognize that guy. Not at all and nothing looks familiar. Behind -- -- not way but your. Close. As Charles Barkley what he thinks of castor. The former NBA -- ripped the women of San Antonio and Castro fired back on line with the Texas size will open. You've not always been very kind in describing the women at San Antonio. May -- that's because we have a very different idea of what a beautiful woman looks like. -- -- -- As a second generation Mexican American Castro has become a strong advocate for affirmative action and a major proponent of improving public education. Harvard law -- husband and father Castro has been compared to another famous keynote speaker. There is not a liberal America and a conservative America there at the United States of America -- political star may have been born. And if this guy is any indication of what's ahead Castro could be drawing himself a big future in the park Dan Butler ABC.
This transcript has been automatically generated and may not be 100% accurate.