New York Times: Laurence H. Tribe, the highly regarded liberal scholar of constitutional law, still speaks of President Obama as a proud teacher would of a star student. He was one of the most amazing research assistants Ive ever had, Mr. Tribe said in a recent interview. Mr. Obama worked for him at Harvard Law School, where Mr. Tribe has taught for four decades. Mr. Tribe went on to serve in the Justice Department during Mr. Obamas first term and has argued in favor of the legal standing of Mr. Obamas signature...