Their faces sometimes twisted in anger, 'tea party' followers have been called neo-Klansmen and knuckle-dragging hillbillies. To be sure, angry town halls, the N-word thrown at black congressmen, and signs comparing President Obama to Adolf Hitler play into the hands of the movement's critics. And demonizing tea party activists tends to energize the Democrats' left-of-center base. But political experts say that many such criticisms are near-sighted, if not outright inappropriate – and ultimately may miss the point. Indeed, polls suggest that tea party activists are not only more mainstream than many critics suggest, but that a majority of them are...