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Why isn’t Rick Santorum the GOP 2016 frontrunner?

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This week Rick Santorum returns to Iowa for the first time since last year’s presidential campaign. For Santorum, whose victory in the 2012 caucuses started an improbable run at the Republican nomination, the visit will look like a campaign swing: an appearance at a party fundraiser, a visit to the Iowa State Fair, a speech at a gathering of social conservatives. Santorum hasn’t signaled...