How alternative media have transformed politics on the left and the right.America’s Right Turn: How Conservatives Used New and Alternative Media to Take Power, by Richard Viguerie and David Franke, Chicago: Bonus Books, 375 pages, $26.95 The Revolution Will Not Be Televised: Democracy, the Internet, and the Overthrow of Everything, by Joe Trippi, New York: Regan Books, 252 pages, $26.95 Like most populist presidential candidates, Howard Dean wasn’t nearly as interesting as the movement that assembled itself behind him. The Vermont doctor was capable of staking out independent positions: He attacked the Iraq war when his party’s leaders were either...