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Romney and Santorum battle for crucial contests in Michigan and Arizona

Today, voters in Arizona and Michigan go to the polls to pick their favorite candidate in the ongoing Republican primary season. The two frontrunners, Rick Santorum and Mitt Romney, are essentially neck-and-neck at the national level going into today’s primaries, but voters in these two states could be setting the stage for next week’s Super Tuesday contests, and determining how long the battle for the nomination will go on.