He was set to appear at a "pro-Israel reception" Monday morning at the home of Judy & Sidney Swartz of Delray Beach.
Prices ranged from $500 per person to $5,000 sponsorships for couples.
Graham is in a solidly Republican state. But he's facing a vigorous tea party challenge in the primary.
The rating from the independent Sabato's Crystal Ball at the University of Virginia, said the contest "leans Graham." That's not a great place to be. Though not as bad as toss-up, Graham is not in as good shape as "likely" or "safe" to win renomination.