Wisconsin Rep. Paul Ryan is popular with conservatives and brings enthusiasm to the ticket. He won his House seat at 28, which means that now, at 42, he's a seasoned legislator.
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Republican presidential candidate Mitt Romney greets attendees at the conference of the National Association of Latino Elected and Appointed Officials in Orlando, Fla., on June 21. The presumptive GOP nominee took knocks from congressional Republicans during the party's presidential primaries.