Ron Paul, of course. Vote for him here.
My liveblogging of the debate is here (I joined it about half an hour into the program). It's less long-winded than the transcript.
By the way, Paul was terrific on the Kudlow show afterwards. Worth hunting down the YouTube footage at some point. He emphasized that smaller government begins with cutting military spending--as well as abolishing the departments of education and agriculture. Bravo! Even Kudlow and company were rather impressed.