It's a measure of how thoroughly the wingnut message skunk works has penetrated the mainstream media that Obama has to defend a trip overseas that should need no defense.
The McCain press release machine has found willing fools among mouthpiece journalists who ask its stupid and invidious questions without regard to whether or not they make sense.
Obama's reply should take the offensive:
John McCain would hold a rally in a heartbeat like the one I held in Berlin and like the one I'll hold in Denver in August, but he could never fill that big a space with people. People come to our events because they're sick and tired of the Karl Rove politics of the past, but that's all McCain has to offer. This dumb question is proof of that.