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Romney works to fend off Santorum challenge

Monday, February 6, 2012 | 6:11 p.m. CST

GRAND JUNCTION, Colo. — Sensing a possible threat, Mitt Romney criticized Rick Santorum's time in the Senate as "not effective" because of his past support for spending on pork-barrel projects as he worked to fend off an unexpected challenge in the next states to vote.

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