The recent terror case of a "gentle" third-grade teacher from the D.C. suburbs shows the danger is at once closer and harder to ID than you think. The enemy is hiding not in the shadows, but in plain sight, and may even wear a smile. Hundreds of Muslims last week flocked to a federal courtroom to show their support for the affable and soft-spoken Ali Asad Chandia of Maryland as he was sentenced to 15 years in prison for supporting terrorists. Friends say anti-Muslim prosecutors railroaded a "law-abiding" and "peaceful" brother. "He is a dedicated teacher," said one. "A great...