Today the U.S. Capitol Police asked for an arrest warrant for Rep. Cynthia McKinney (D.-Ga.) for assaulting a police officer who failed to recognize her as a member of Congress. But the larger question might be: Are the Capitol Police at fault for not recognizing her? McKinney, whose hair is usually styled in braids, wore a traditional “afro” that day and was not wearing her lapel pin that identifies her as one of the 535 members of Congress. When she attempted to sidestep a metal detector, as members are permitted to do, she was asked three times by a police...