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Romney, Santorum go to wire in Michigan

On the eve of a close Michigan showdown, Mitt Romney and Rick Santorum swapped insults on the economy Monday.

"Senator Santorum is a nice guy, but he's never had a job in the private sector," Romney said as he and his closest rival in the Republican presidential race charged across the state in a final day of preprimary campaigning.

Santorum said Romney's tax cut plans mirror the rhetoric of Occupy Wall Street and include "just more Obama-style class warfare."

Polls showed a close race in Michigan, where Romney was born and won a primary in his first bid for the White House four years ago. Santorum surged unexpectedly into contention two weeks ago, benefiting from caucus victories in Minnesota and Colorado and stressing unflinching conservative views on social issues. No matter the winner, the two men stand to split the 30 delegates at stake.

By contrast, Romney is favored to capture Arizona and all 29 delegates in today's other primary. There, the campaigning has been scarce and the television commercials ever scarcer, sure signs that Romney's rivals have scant hope of an upset.

Neither of the other two contenders, Newt Gingrich or Ron Paul, has made much of an effort in either Michigan or Arizona.

Romney currently has 123 delegates to 72 for Santorum, 32 for Gingrich and 19 for Paul in an Associated Press count, with 1,144 required to win the party nomination this summer at the Republican National Convention in Tampa, Fla.

Santorum got an early jump on the day with an Op-Ed article in the Wall Street Journal where he outlined a plan he said would cut taxes, spending and benefit programs while balancing the federal budget before the end of a four-year term.

He said Romney's recent call for across-the-board income tax cuts was a last-minute conversion that merely copied his own proposals.