AP: Romney wins AZ, battles Santorum in Michigan

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WASHINGTON (AP) -- Former Massachusetts Gov. Mitt Romney has won the Arizona primary.

Romney and Rick Santorum, meanwhile, are vying for supremacy in Romney's native Michigan, with early returns showing them in a close race.

With 13 percent of Michigan precincts voting, Romney with 41 percent leading Santorum with 38 percent, Ron Paul at 11 percent and Newt Gingrich with 7 percent.