What Linda Ronstadt did in Las Vegas was badmouth G. W. Bush and dedicate three consecutive songs to him: "Your No Good", "Straighten Up and Fly Right" and one more.

By that time, the crowd was filing out of the room and demanding refunds. They got 'em.

The Dixie Chicks also badmouthed G. W Bush and said they were ashamed to be from Texas because of him, and that he was not their president.

Note, this political crap is abusive of a paying audience and has little/nothing to do with the music.

Reasonable topical songs like "Over the Hill to the Poorhouse", "Mary of the Wild Moor", "A Drunkard's Dream" and numerous other songs are reasonable fair. They aren't political in the same way as a song that proclaims "I Hate...".