MADISON, Wis. -

Musician John Mellencamp wants Republican Wisconsin Gov. Scott Walker to know that he supports collective bargaining and union rights and Walker should know that before using his song "Small Town" on the campaign trail.

Mellencamp's publicist Bob Merlis told The Associated Press on Wednesday that Mellencamp wanted him to reach out to Walker not to ask him to stop using the song, but to inform him of his liberal beliefs.

Merlis said that is a standing policy of Mellencamp's whenever a politician uses one of his songs.

Merlis said he became aware Walker was using "Small Town" after reading a news story about a campaign stop Tuesday in Milwaukee.

Walker's campaign spokesman did not immediately return a message.