On September 19, Omar Gonzalez jumped the North Fence, ran across the White House lawn, up the steps of the North Portico and into the front door of the White House. He was armed with a 3-inch serrated knife. He entered through an unlocked door, passed the staircase to the presidential residence and into the East Room of the White House. The White House is supposed to be one of America's most secure facilities. So how did this happen? How could Mr...