DES MOINES, Iowa--He's mentioned during the presidential candidates' speeches. His image appears in their political ads. Is Tim Tebow the new Ronald Reagan? What does a young NFL quarterback have to do with politics? Nothing, really. But the born-again athlete's star power and popularity have prompted several of the presidential candidates to try to hook themselves to his star. A political action committee supporting Bachmann is the latest to get in on the Tebow comparison, running TV ads in Iowa that liken her to the 24-year-old born-again Christian.