CONCORD, N.H. - Rick Santorum found out the hard way Thursday that he wasn't in Iowa anymore, earning boos and catcalls from a roomful of college students for equating gay marriage to polygamy during a spirited debate over traditional values.

Several students challenged Santorum, a committed culture warrior, over his long-standing opposition to same-sex marriage. Instead of saying he disagreed and changing the subject - as many politicians might have - Santorum launched a law-school-style Socratic exercise, answering questions with questions.

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