Iowa Race Keeps Shifting All the Way to the End

Erin McPike, RCPMARSHALLTOWN, Iowa -- With four days left until the Iowa caucuses, Rick Santorum finally has become the flavor of the month in the volatile Republican presidential race here.He has lagged in the bottom tier of public polling all year long. He's someone who lost his race for a third term as the junior senator from Pennsylvania by an eye-popping 18 points back in 2006. And he's talking more about abortion, marriage and Iran than the economy.And yet, finally, Santorum has gotten his moment in the spotlight -- and it's at just the right time. There's no telling now who will...

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