Giuliani, Thompson skip out on the RNC?

What is this?

Two of the four leading Republican contenders left before speaking to a fundraising dinner Tuesday night for the Republican National Committee.....

Former New York City Mayor Rudy Giuliani and former Sen. Fred Thompson (Tenn.) made brief remarks to a closed-press reception before the dinner began but then left even though they were scheduled to address the dinner.

What? They had somewhere else to be?