I vote for arrogance.
Also he was totally enclosed in the "Boston" culture, who think like he does (in their isolated enclave of wacky elitism). Talking only to "yes" men can lead to unreal views of the world (another reason he should not be commander-in-chief).
Also the poodle liberal press does him a disservice by letting him think that he can walk on water and get away with it.
And finally the Bush campaign is so very good at letting the opposition go way out on a branch and then cutting it off.
Yes, but be clear that the Bush campaign has nothing to do with the Swiftboat ads.