PEWAUKEE, Wis. (AP) -- The Republican presidential candidates are focusing on Wisconsin, and front-runner Mitt Romney is appearing more and more confident that he's closing in on the nomination.
He's concentrating entirely on President Barack Obama during campaign events across the state, which holds its primary on Tuesday.
Rival Rick Santorum is trying to raise doubts about Romney's conservative credentials on the last weekend of campaigning before the critical showdown.
It's Santorum's last chance to prove his strength in the industrial heartland, where he's said he can challenge Obama, but where Romney has beaten him consistently.
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