It was a great night for Rick Santorum, who with a big margin in El Paso County (Colorado Springs) beat Mitt Romney 40%-35% in Colorado and won by much bigger margins in Missouri and Minnesota. No delegates, but Santorum must now be regarded as a serious challenger to Romney.

And a very bad night for Newt Gingrich, who couldn’t manage to get on the ballot in Missouri, finished fourth in the conservative-heavy caucuses in Minnesota and just barely edged Ron Paul out of third place in Colorado 13%-12%. He’ll presumably be in the Arizona debate February 22, but will he get much coverage other than that?