It's a familiar sight. Touring teenagers perched on the Capitol steps, listening with varying levels of attention to their representative welcoming them to where laws and history are made. But Scott Garrett uses the occasion his own way. "I explain something they won't hear anywhere else,'' says Garrett, a four-term Republican congressman from New Jersey's 5th District. "They won't read it in textbooks." So he describes the rise of the Supreme Court from a relatively weak office to a third, co-equal branch of government. Part of why it happened, he says, was the erection 75 years ago of the neoclassical...