At the last minute:
Among the five polls that were conducted over the weekend — including those that had been included with the previous update — three give Mr. Romney a small lead while two show an edge for Mr. Santorum. Mr. Romney still has the advantage in the FiveThirtyEight forecast, but it is more tenuous than the one we released overnight. The model gives him a 64 percent chance of winning the state, down from 77 percent in the previous forecast.
John Cassidy is now betting on a Santorum win. To help ensure that outcome, Kos is encouraging Democrats to vote for Santorum:
This race is obviously so close that a few thousand votes could make the entire difference. Either Romney wins, and takes a big step toward sewing up the nomination sooner rather than later, or Santorum wins, and the GOP nomination contest remains in chaos, and indefinitely so. It's clear that Democrats and the Obama campaign prefer the latter option, otherwise they wouldn't be spending hundreds of thousands of dollars hitting Romney in advance of tomorrow's primary.
Kornacki asks:
[I]f [Santorum] ends up making it a long night and only falling a point or two short, how much of a win will that be for Romney?
(Photo: A volunteer passes out campaign stickers for Republican presidential candidate, former Massachusetts Gov. Mitt Romney during a campaign rally at Byrne Electrical Specialists on February 27, 2012 in Rockford, Michigan. By Justin Sullivan/Getty Images)
The Dish 