Eric Gay, Associated Press
DETROIT — Republican Mitt Romney staved off calamity in his presidential bid by returning to a familiar plan: Attack the surging rival.
He won Tuesday's primary in his home state, Michigan, after assailing conservative challenger Rick Santorum's principles and conservative credentials, both considered Romney's own weaknesses by some of his critics.
With a big win in the Arizona primary the same day as his Michigan victory, Romney enters the 10-state Super Tuesday gauntlet on March 6 as the clear national front-runner. But Santorum's strong showing underscores the lingering doubts conservatives have about the former Massachusetts governor.
"We didn't win by a lot but we won by enough and that's all that counts," Romney said Tuesday night as he thanked supporters in Michigan.
Romney adopted a new theme — "More jobs, less debt, smaller government" — and focused tightly on the economy, the biggest issue in the long-suffering manufacturing state.
Romney also had more of Michigan's Republican GOP establishment on his side, including Gov. Rick Snyder, and a vast campaign structure, partly left over from his win in the 2008 primary.
Santorum, after storming into the state after a three-state sweep Feb. 7, slipped in the closing days by letting go the populist economic message that helped him emerge as the chief threat to Romney.
Romney fought hard against the challenge from Santorum, as he did in quelling the advance of Newt Gingrich in Florida.
The front-runner seized on comments Santorum made during an Arizona debate last week, when the former Pennsylvania senator said he had voted for legislation he disagreed with in order to support his party.
The comments allowed Romney to cast himself as an outsider from unpopular Washington and cast Santorum as a Beltway creature.
Romney also pointed to votes by Santorum, a hero to anti-abortion activists, for legislation that helped finance abortion provider Planned Parenthood. And he slammed Santorum's endorsement of Arlen Specter, a former Pennsylvania Republican senator who supported abortion rights.
"We can't continue to take one for the team," Romney told more than 2,000 people in Troy Saturday. "My team is the United States of America and I'm going to fight for that team, not the partisans in Washington."
By attacking Santorum, Romney took advantage of how little voters knew about the candidate who campaigned in obscurity throughout last year, only to emerge as the surprise winner in the Jan. 3 Iowa caucuses.
"Romney nailed Santorum upside the head with his record on spending and his Washington connections. I think that resonated," said Jeff Timmer, a Michigan GOP campaign strategist and former Michigan Republican Party director. "By primary day he wasn't the shiny object anymore. The new car smell was gone."
A political action committee that supports Romney, Restore Our Future, came to his aid in Michigan, just as it did in Florida and Iowa last month.
The group spent more than $1 million in the final week of the Michigan campaign on TV ads attacking Santorum. They helped give Romney a better than 2-to-1 edge in ad spending over Santorum and a group that supports his candidacy.
Romney built an early edge in absentee votes cast before Tuesday, the product of months of planning to compete again in the primary he won in his unsuccessful bid for the 2008 nomination. As much as one-quarter of Tuesday's votes were expected to have been absentee, party officials said.
Romney also made a direct appeal to Michigan's struggling economy by proposing measures that he argued could help the struggling automotive industry recover over the long term.
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