Politics: Delegate Math After March 10
The above screen grab is the projected delegate allocations from the March 10 events from RCP.
Romney got 32 while Santorum got 33.
In basketball terminology, Santorum can't afford to trade baskets with Romney. At some point sooner rather than later, he needs to score points AND play defense to cut into Romney's lead.
March 13 is Alabama, Mississippi, Hawaii and American Samoa.
Clearly Romney would want to win all four of these races to put the nomination race away but the delegate math says if he splits them with Santorum, he retains his lead and the clock continues to tick down on Santorum.