This commentary was written by William B. Irvine, professor of philosophy at Wright State University. You might remember that the Rev. Jeremiah Wright was President Barack Obama’s pastor before the relationship became politically inconvenient. Although I disagree with many of Wright’s views, I welcome him to our campus. Universities should be a marketplaces of ideas. My colleagues, I think, share this belief. And, yet, in the last decade, Wright State has been curiously one-sided in the speakers it brings to campus. Liberal speakers are routinely invited. We also invite speakers who can be characterized as ultra-liberal, including Wright, and, two...