Forty-two delegates are up for grabs when Wisconsin holds its Republican presidential primary Tuesday. But for Rick Santorum, much more appears to be at stake.

The Badger State may be the former U.S. senator from Pennsylvania’s final chance to convince Republicans that the race for the GOP nomination isn’t over.

Wisconsin joins Maryland and the District of Columbia in holding primaries on Tuesday.

While polls suggest former Massachusetts Gov. Mitt Romney is the overwhelming favorite in Maryland and D.C., Romney holds only a single-digit lead over Santorum in Wisconsin, which could be one of Santorum last opportunities to slow down Romney’s march towards clinching the nomination.

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