The Obama campaign has written radio stations in Pennsylvania and Ohio, pressing them to refuse to air an ad from the National Rifle Association."This advertisement knowingly misleads your viewing audience about Senator Obama's position on the Second Amendment," says the letter from Obama general counsel Bob Bauer. "For the sake of both FCC licensing requirements and the public interest, your station should refuse to continue to air this advertisement." The ad, "Hunter," conflates Obama's anti-gun stances of the 1990s with his current, more pro-gun, stand, and was chided for inaccuracy in The Washington Post, an item to which Bauer's letter refers.NRA spokesman...