I believe it wasn't the comments about Bush that alienated their fan base as much as some of their insulting comments about their fans in an interview some time later.
They truly are the Ditzy CHicks.
Shhhh, don't tell them. They still think it's over President Bush. The Dixie Chicks obviously think people are required to listen to them after they are insulted by three dumb*sses who think they can sing.