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Santorum challenges Romney

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(CBS) - GOP hopeful Rick Santorum will campaign for a second day in Michigan today.

He's leading in the polls there and is working to keep his advantage in the state where Mitt Romney grew up. Santorum is hammering away at Romney's opposition to the auto bailout and alleged inconsistencies.

Romney is scheduled to campaign in Idaho while Newt Gingrich heads to Georgia- the state he served as a congressman. Ron Paul will be in Washington state.