Browne sued McCain for using his song "Running on Empty" in a campaign video without his permission. This isn't the first time McCain used music without permission in a political campaign. In 1780, he was sued by Mozart.
Jackson Browne - 8 Jokes

Throw on some Jackson Browne and grow your hair out
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Jackson Browne Suing McCain Over Unauthorized Use of Song
The singer-songwriter sued McCain and the Ohio and national Republican committees in U.S. District Court in Los Angeles on Thursday, accusing them of using his song "Running on Empty" without his permission.
Ironically, if Browne wins a huge settlement, the McCain campaign will be "running on empty."

Jackson Browne Campaigning for Edwards
Jackson Browne says that Democrat John Edwards is the most progressive candidate with a chance at winning the White House, and that he would do the most for working-class Americans. (AP)
While Edwards welcomes Browne's presence and support at campaign rallies, he has requested that Browne refrain from singing two of his biggest hits: "Running on Empty" and "The Pretender"