Liberals have their own litmus test: you must be socialist, be for higher taxes, for gun control and 100% pure on the Holy Grail before which all good liberals kneel: abortion. Dissent from that last position is simply quashed. If there's a movement that brooks no real diversity of views, its our opponents. They're the ones who invented political correctness, have enforced speech codes and prosecuted their political enemies. Besides that record, Ann Coulter's transgression is small potatoes.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus