Mitt Romney Edges Out Rick Santorum in Michigan Squeaker

Solid win in Arizona for Romney, but slender margin in home state shows weakness.

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Despite his two victories Tuesday, Romney's image has suffered across the country. A new Washington Post poll finds that Romney's favorability rating nationally is only 37 percent among conservative Republicans, independents with incomes under $50,000, and white voters who never graduated from college. He would need enthusiastic support from all those groups to win the general election.

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