According to American Spectator‘s Prowler, Romney’s over-eager approach to courting endorsements in Florida backfired spectacularly on him:

In the past week both Florida Sen. Mel Martinez and Gov. Charlie Crist wavered on their promised endorsements for Sen. John McCain, before finally having their fill of the heavy-handed arm-twisting of the Mitt Romney campaign.

“It finally got to the point for both of them that they just got fed up with the constant harassment,” says a source close to both men who has worked for them as a political consultant. “They weren’t going to endorse Romney and under the right circumstances, one or both of them might have chosen to sit the primary out, but the Romney people just made it intolerable.” 

Note: Sorry for the interruption Sunday night.  Whatever server problems there were seem to have been resolved.