Romney wins Michigan and Arizona primaries

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WASHINGTON (AP) -- Mitt Romney has won Republican presidential primaries in his home state of Michigan and in Arizona, besting Rick Santorum with a pair of victories certain to shore up Romney's struggling campaign.

With 71 percent of Michigan's precincts reporting, Romney has 41 percent to Santorum's 37 percent. Ron Paul is in third place with 12 percent, and Newt Gingrich is bringing up the rear with 7 percent.