Mitt Romney is in a bit of a bind.
The GOP primary electorate is bound and determined to hold a certain position on immigration. This position, though, does not seem to play well when it comes to the general election.
In essence, to secure the nomination, he may have to cripple his chances in the general.
It's not a good spot to be in. In essence, those who have demanded a hard line on immigration have now effectively ruled out John McCain, who at this point would be as much an automatic winner in the general as Rudy Giuliani, by virtue of holding Ohio (Giuliani would flip New Jersey and Pennsylvania).
What is Romney's path? Michigan might be the opening, but it is far less certain, due to the influence of the labor unions.