Natalie Maines makes this list mostly for her 2003 comments about President Bush, but she's always been active behind the scenes. According to research done by the Tennessean, Maines donated nearly $7K to Democratic political causes and candidates between 1992 and 2007, and supported Barack Obama in 2008.

The Dixie Chicks singer hasn't made much of a statement lately on Twitter, aside from one post reading "Obama!" in September.