Ed Rendell: Santorum 'enormously effective' at getting earmarks as Pa. senator

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Santorum's come-from-behind performance in the first presidential contest pits him against GOP front-runner Mitt Romney. And targeting transportation spending for things like Amtrak are a standard part of Romney's stump speech.

In an op-ed published last fall in a newspaper of the next state to vote, Romney called Amtrak "a classic example" of "functions that the private sector can perform better than the public sector."

Romney defeated Santorum by just eight votes in Iowa, though polls show him holding a wide lead in New Hampshire.