If one were to generously give Santorum WI, most of LA & PA, plus a piece of NY, maybe he takes 140 to Mitten's 235.
But if Mittens takes WI (likely given Illinois), takes MD (which tilts urban these days), and gets over 50% in NY (less likely but not improbable), best Santorum can manage is something like 75 to Mitten's 300.
Super Tuesday II is the last chance to derail Mittens and yet it figures to be his best day of the primary season. Only the GOP could devise this system.
I used numbers from Wiki. There is some confusion between committed and uncommitted numbers. So all counts are tentative, however close enough for making a hypothesis.