Rick Santorum could take Republicans down with him

Republicans haven't quite thrown away what they see as a winnable presidential election, at least not yet. But they're trying their best.

In GOP circles, there is more than a whiff of panic in the air. Unemployment is still painfully high, Americans remain dissatisfied with the country's direction, even the most favorable polls show President Obama's approval at barely 50 percent — and yet there is a sense that the Republicans' odds of winning back the White House grow longer day by day.

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