Pollster.com has tag clouds for last night's Republican debate and last week's Democratic debate. Its worth noting the striking differences in the use of language. (via Daily Kos)
Without having seen the debates, I can say with confidence that Biden, Dodd, and Gravel were too wordy, Edwards was populist, and Obama spoke a completely different language. Also, based on language it looks as if Romney and McCain went for flag waving populism, although McCain, being a Senator, did fret a bit about political process.