On languagelog, there is an analysis of the language and pauses in the recent Bush-Kerry 'debate'. The level of the analysis is phenomenal, and I can only wonder at how much time was spent putting it together!
Apparently Kerry used sentences which were 17% longer than Bush. He did this to a small extent by using fewer sentences (less than 2% fewer), but in the most part by using more words. Bush paused for longer times, where Kerry tended to pause for shorter times, and did so more deliberately.