McCain's a classy guy, and that speech showed it. It's a shame he allowed the people running his campaign to resort to mudslinging and negative tactics (although I think this has been one of the cleaner presidential campaigns of my adult life, and I realize a lot of people disagree with me on that issue). I really think that damaged his reputation.
It's a shame his audience didn't share in that class. It was pretty tacky to boo Biden, but I can give them that - they did just lose.
McCain fought a good, hard campaign, and I might disagree with him, I'll give him props for being a good American and doing what he thinks is best for his country.