For my money, what's working for Romney is George H. W. Bush's old favorite, "the big mo" aka momentum. Romney won Arizona and Michigan, and then Washington.
These states have had more impact than the three previous that Santorum won. Perhaps it is because Santorum has alienated modern women. The other DrC said she couldn't vote for him - not a good sign.
This GOP primary season has certainly demonstrated unpredictability. That said, anything other than an eventual Romney nomination will be a surprise to me.
