I can’t say it better than David Bernstein did, so I’m just reproducing his post:
As co-blogger Jonathan reports below, the Obama campaign has sicced its lawyers on t.v. stations that might air a well-sourced NRA advertisement that correctly points out Obama’s longstanding anti-gun record. 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 threatening legal action against stations that run it, in violation of the First Amendment.