According to the Tampa Tribune:

Obama also appeared to violate a pledge he and the other leading candidates took not to campaign in Florida before the primary.

How?

After the fundraiser at Scarritt’s Hyde Park home, Obama crossed the street to take half a dozen questions from reporters waiting there.

The pledge covers anything referred to in Democratic National Committee rules as “campaigning,” and those rules include “holding news conferences.”

Obama seemed unaware of that. Asked whether he was violating the pledge, he said, “I was just doing you guys a favor. … If that’s the case, then we won’t do it again.”

That was less than a day after the pledge took effect Saturday, and Obama is the first Democratic presidential candidate to visit Florida since then.