Newt Who? Rick Santorum Sweeps Colorado, Minnesota and Missouri

Rick Santorum has won the Colorado caucuses, completing a superbly improbable sweep of the three states that voted Tuesday night. When the last precincts reported around 1 a.m. EST on Wednesday, Santorum had 40.2 percent of the vote in Colorado to Mitt Romney's 34.9 percent. Newt Gingrich and Ron Paul trailed with 12.8 percent and 11.8 percent, respectively.

Recent polls had shown Santorum leading in Minnesota and Missouri, so those two wins did not come as a surprise. But his victory in Colorado was very much unexpected and a huge embarrassment for Romney, who took 60 percent of the vote there in 2008 and led the most recent pre-caucus poll by 10 percentage points.

The message of Tuesday's results was clear: Republicans are still searching for a conservative alternative to Romney, and Gingrich is no longer it. That title is now Santorum's to lose. His task is to turn his three-state sweep into something durable -- and he will have to do so amid the toxic barrage of attack ads and stump-speech criticisms reserved for the front-runner du jour.

University of Colorado at Denver political scientist Michael Cummings added that Santorum still has a lot of work to do when it comes to broadening his base. But that's tomorrow's discussion. Tonight, a campaign declared dead mere days ago is celebrating the unlikeliest of revivals.