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Iowa by the numbers

Selzer & Co. president Ann Selzer breaks down the numbers behind her new Bloomberg/Des Moines Register Iowa poll. Trump leads by 3 points in Iowa, but Selzer notes that if conservative and evangelical voters show up in big numbers, Cruz could pick up steam. On the Democratic side, Selzer says Vermont Sen. Bernie Sanders possesses "Obama appeal," attracting younger voters to the voting booths.
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