I've mostly been a lurker lately, but I felt like throwing in my perspective here.
I thought using Paris and Britney was lame on McCain's part, but when I watched it, I found it wasn't the whole ad like the headlines had led me to believe- it was just 2 seconds. His point was that Obama is just a celebrity who's no more fit to be president than any other celebrity. The rest of the ad focused on policy.
The fact is, both candidates are inadequate for their own reasons and neither of them are behaving well. If you think Obama's acting more civilly than McCain, consider this quote by Obama:
"So what they're going to try to do is make you scared of me, you know, he's not patriotic enough, he's got a funny name, you know, he doesn't look like all those other presidents on the dollar bills."
McCain accused him of playing the race card and Obama denied it. I might be willing to give Obama the benefit of the doubt, except for a very similar remark he made in June that got little attention:
"They're going to try to make you afraid of me. He's young and inexperienced and he's got a funny name. And did I mention he's black?"
His use of the race card is pretty blatant there. Basically, he's preemptively accusing his opponents of racism, which is a very serious charge in this country.
Barack Obama has positioned himself as a post-racial healer who's come to bring people together and end divisiveness. Comments like these show otherwise. But then, one only needs to look at his radical record over the years to see that he's hardly the uniter he pretends to be.