Two thoughts:
McCain is upset because he sees his hard fought-and-won legislation, which will forever have his name on it, doing just what opponents said it would do. Now they're right, he's wrong, and he is embarassed. BTW, I like the guy.
Secondly, GOP ads have not been negative. Others like the swift boat ads are negative.
But not nearly as negative as a Soros sponsored ad for Kerry that alludes to Bush as Hitler.
And a third, bonus thought!
Why did Kerry put his four months out there as his centerpiece instead of his twenty years in the Senate?
Just a thought for inquiring minds...