Copyright is one thing, but other issues may be involved if a political campaign appropriates a particular performance of a particular song as its campaign “theme song.” Think here of FDR’s use of “Happy Days Are Here Again,” or Bill Clinton’s use of Fleetwood Mac’s “Don’t Stop Thinking About Tomorrow,” or Barack Obama’s use of Stevie Wonder’s “Signed, Sealed, Delivered.” I assume these particular uses either were authorized or the artists didn’t object, because they continued throughout the candidates’ respective campaigns. But unauthorized use in that manner could in some states violate the musician’s right of publicity, or possibly give rise to a claim of trademark dilution under the federal Lanham Act. The problem is that this sort of repeated, high-visibility use of a particular song by a particular artist may create the false impression that the artist is endorsing or somehow connected to the candidate or the campaign. That’s not a copyright issue. Copyright licenses can cover the playing of random songs at campaign events. They don’t cover anything that smacks of an endorsement.