As the Republican candidates play out their presidential nominating bids in three states on Tuesday, predictions are mounting that Rick Santorum will have a good night after pulling ahead in Midwestern polling.

But Mitt Romney still has the line on Colorado, which like Minnesota, is holding caucuses on Tuesday night that won’t commit delegates but should provide some insight into the trajectory of the candidates. Missouri is holding a non-binding primary that sets up the standings for the delegate-awarding caucuses in a month from now.

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