From the Romney camp:
Each day Senator Santorum continues to march up this steep hill of improbability is a day we lose to unite in our effort as Republicans to defeat President Obama,"
So as Senator Santorum continues to drag out this already expensive, negative campaign it is clear that he is becoming the most valuable player on President Obama's team.
watch for more major establishment figures to come forward to both support Romney and carry a more overt warning to Santorum about what his continuing on his current course could mean to his political future.
Will he show himself to be a Republican first of a sore loser.... the choice is up to him and his political future depends on it.