Looking back to yesterday, this appeared on MSNBC’s First Read blog:

McCain leads both Obama and Clinton in potential general-election match ups with either candidate in the all-important swing state of Florida, according to a Mason-Dixon poll out today.
McCain leads Obama 47%-37% and Clinton 49%-40%. The Arizona senator leads the Democrats across the board. About 80% of Republicans are behind McCain. Only 66% of Democrats are behind Obama and 72% are backing Clinton in one-one-one match-ups with McCain…Those numbers though could be a reflection of McCain being the presumptive nominee and Obama and Clinton still engaged in a fight for the nomination.

The numbers could mean that. Or they could be a sign that Florida won’t be competitive enough to blame it on the butterfly ballots.