Sorry if this sounds incredibly hackish...
Has it been confirmed that those robocalls urging Democrats to vote for Santorum actually came from the Santorum camp (or an associated super PAC)?
My father, a Republican, got one such call directed toward me
as a Democrat. I was out of town most of the day at the end of a cross-country rail trip... and I chose to make an essentially meaningless vote in the Democratic primary to make political mischief on my part impossible.
I just asked. As an authoritarian populist, Rick Santorum scares me.