Will Santorum Score a Meaningful Upset?

As votes start to come in, all signs point towards a Rick Santorum victory in the Minnesota Caucus.  This will no doubt upset the Romney freight train and cause a lot of discussion in the political world.  Santorum was unable to gain momentum out of his belatedly-declared Iowa Caucus victory.  Will this prove different?

Romney is heavily favored to win the Colorado caucus, but given his 60% win in 2008, will anyone really be impressed if he wins with a plurality?

Missouri is just a beauty contest, with no delegates at stake (those get decided in a March caucus and a later state convention), but if Santorum runs the table on Missouri and Minnesota tonight, does it build his narrative as the logical and viable alternative to Romney?

Fun stuff tonight.