@Woiyo9,
You refuse to believe... right.
The message -- that McCain is suddenly trying to grab the "change" mantle, even though McCain's policies are just standard Washington sameness -- is central to Obama's campaign, and a big part of why people support him. It'd be an applause-getter. And people react well (from my own experience, in the audience at rallies) when Obama shows some fire.
But again, that fire was directed at McCain's policies. Just wasn't anything untoward there.