I'm still leaning towards Mark Warner for 2008, but
Feingold performed quite well with George Stephanopoulos this morning. He answered the faith question well. He answered the liberal question well. He answered the national security question well. And most importantly, in my opinion, he stated that universal health care is his top priority. He finished by saying that America needs a "cheesehead president".
I predict a legendary Warner-Feingold-Clinton battle in 2008. I'm still supporting Warner because it would be naive to ignore the historical advantage that southern governors have over northern senators, and Warner's recent Meet the Press performance was impressive. The country is fed up with the Bush agenda, and Warner has the ability to win over those important swing votes.
Having said that, I would be very inspired by a Feingold campaign that embraces liberal values. Gore couldn't sell liberalism. Kerry couldn't either. Maybe Feingold is the messenger we've been looking for?