ATLANTA (AP) — Republican presidential candidate Rick Santorum says Mitt Romney's initial reaction to a question about a contraception measure in the U.S. Senate shows he's not conservative "at the core."At a rally in Atlanta, Santorum said Romney's "gut reaction" should have been to support the bill by Sen. Roy Blunt of Missouri. The measure was defeated Thursday in the Senate. Critics say it would have limited insurance coverage of birth control.Romney told one interviewer that he opposed the measure. He reversed himself in a follow-up interview, saying he misunderstood the question.Santorum says Romney only changed positions after speaking with his campaign consultants. Santorum said voters deserve a GOP candidate like him, someone who "at the core" believes in conservative issues and doesn't put them on the back burner.

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