AS THE HOPELESS but energetic presidential campaign of Rep. Ron Paul, R-Texas, builds momentum in name recognition, fundraising and cross-ideology appeal, some conservatives are beginning to attack him in earnest. A GOP consultant condemns Paul's "increasingly leftish" positions. Syndicated columnist Mona Charen calls Paul "too cozy with kooks and conspiracy theorists." Film critic and talk-radio host Michael Medved looks over Paul's supporters and finds "an imposing collection of neo-Nazis, white supremacists, Holocaust deniers, 9/11 'truthers' and other paranoid and discredited conspiracists." For the most part, these allegations strike me as overblown and unfair. But, for argument's sake, let's say they're...