The delegate math says that Romney gets a boost today; Santorum failed to qualify for delegates in some districts of Ohio and is not even on the ballot in Virginia. But lacking the clear wins he desperately needs in Ohio and Tennessee, where polling indicates statistical ties, will Romney see his own shadow and retreat back to more weeks of interminable campaigning?
Unless Santorum squeaks out wins in both states, probably not:
...once the Death Star got focused, Santorum's numbers began to bleed. Tennessee would appear to be the key. If Santorum holds on there, he can argue plausibly that Romney still cannot close the deal with the voters he needs the most in the fall. A Republican candidate with a demonstrable weakness in the South is every Republican playa's worst nightmare. But this still remains a contest between an actual campaign and three cults of personality. 'Twas ever thus.