Sorry about that last post - I was a bit angry.
Anyway, I wanted to link to this fun little bit about Mellencamp asking John McCain to quit using his songs at campaign rallies. Mellencamp, an Edwards supporter and ardent Democrat, doesn't want anyone to think he supports Johnny Mac.
The bad news is this - every time in recent memory an artist complained about a presidential candidate's music selection, the candidate went on to win. In 1984, Ronald Reagan (somewhat quixotically) wanted to use Bruce Springsteen's "Born in the U.S.A" and was shot down by the Boss - he went on to win. In 2004, George W. wanted to use the Foo Fighters' "Times Like These" and Dave Groel said no.
You have to feel for the Republicans, though. If they want to rock, they're pretty much left with Skynyrd and Ted Nugent. (I think the Ramones were Republicans, but "I Wanna Be Sedated" is not the message you want to be sending to the voters.)