As one member of The Volokh Conspiracy said,
The proper response to such attempts to infringe on the First Amendment is to make sure that the video in question receives the widest circulation possible, to deter the Obama campaign, and other campaigns for that matter, from engaging in such tactics in the future. So here it is. Share it with a friend, with a note that Obama is in violation of the First Amendment, threatening legal action against stations that run it.