Andrew Sullivan
As illustrated out today in Best of the Web (scroll to the bottom), Andrew Sullivan seems to be moving back to his natural home on the left side of the spectrum. I don't begrudge him his views, and I refuse to slander the guy, out of respect for the outstanding analysis he did in the years following 911. I think I'll always be a fan, even if he sinks fully into the fever swamps of the Left and never recovers.