The Not-So-Special Interests"Lobbyist" tends to be used as a dirty word in politics. Indeed, during the 2008 presidential primary campaign, Hillary Clinton was derided for even suggesting that some lobbyists represent "real Americans." But although many popular commentators position interest groups as representatives of specialnot "public"interests, much organized advocacy is designed to advance public interests and ideas. Advocacy organizationsmore than 1,600 of themare now an