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Decoder Is Julian Castro the Democrats' Marco Rubio? (+video)

Julian Castro, the keynote speaker at the Democratic convention, is a young Hispanic politician on the rise, like Sen. Marco Rubio. But in some ways, he has more in common with Barack Obama.

Charles Dharapak/AP

Who is Julian Castro? He’s the mayor of San Antonio, Texas, and tonight’s keynote speaker at the Democratic National Convention, that’s who.