Full disclosure: I did not listen to the entire McCain speech last night. But I did see just enough to reaffirm my long-held belief that John McCain is among the worst public speakers in politics.
Why? Because right after he delivers this line -- "we will encourage the development and use of flex fuel, hybrid and electric automobiles" -- he involuntarily raises his eyebrows for a half-second as if to say "yeah, we'll do that."
See the subtle tic yourself by skipping ahead on this video to 33:25 or so.
This article sums up the speech pretty well (in my opinion):
http://www.washingtonpost.com/wp-dyn/content/article/2008/09/04/AR2008090402842.html?nav=rss_opinion/columns