ST. PAUL, Minn. — Mitt Romney could face a significant challenge in Minnesota.

The mood has changed since the former Massachusetts governor won the state's caucuses in 2008. A state that once took pride in political consensus has turned as contentious as any other. Last summer's bitter government shutdown was a lowlight.

Romney campaigned four years ago as the more conservative choice than Arizona Sen. John McCain. This time around, Romney is the mainstream front-runner up against more conservative rivals, former House Speaker Newt Gingrich and former Pennsylvania Sen. Rick Santorum.

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And that makes Tuesday's caucuses unpredictable. Chuck Slocum led Minnesota Republicans in the mid-1970s. He says the activists expected to dominate small turnout are among the most conservative in the country.

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