After Many Momentum Shifts, Michigan Is Too Close to Call  —  People sometimes apply the term “tossup” a bit too broadly, using it to refer to anything close enough that they don't want to render a prediction about it.  —  In Michigan, however, the term is appropriate.

Momentum back toward Santorum in MI?  —  PPP's final poll in Michigan finds Rick Santorum holding on to the smallest of leads with 38% to 37% for Mitt Romney, 14% for Ron Paul, and 9% for Newt Gingrich.  —  It's always good to be cautious with one night poll numbers, but momentum seems to be swinging in Santorum's direction.

Romney also said he voted in Dem primaries to influence the race  —  The Romney campaign has been denouncing Democratic efforts - and now those by Rick Santorum - to get Democrats to vote in Michigan's open primary.  —  Mitt Romney himself called it a “new low” in politics in a round of TV interviews.