I fully agree that free speech is what universities should be about.  Closing off one side of the debate is a practice that I would expect from some 2nd world dictatorship that is wholly bent on articulating just one version of a particular world view.  

Having said that, I happen to disagree with Ann Coulter on much of what she says, but as Reich mentions in his own statements regarding Coulter's right to speak:  “How can students understand the vapidity of Coulter’s arguments without being allowed to hear her make them, and question her about them?”

Allow Coulter to make her speech and allow her to be questioned and challenged on her statements.  Shutting her out just gives her a platform to say that she's being discriminated against (which she is).  Also, shutting her out entirely just makes the university look like a narrow-minded and one-sided institution for prohibiting such discussion and debate in the first place.