Beyond a pair of loses Tuesday, one potentially troubling sign for Mitt Romney is his slippage among "economy voters." The chart below compiles data from the Republican contests with exit polls. It shows Romney's once big advantages among these voters has dissipated significantly as the primaries have unfolded. Or is it just a rough Southern patch for the former Massachusetts governor?

(See Romney over Rick Santorum and Romney over Newt Gingrich columns.)

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