Cowboys, in the scornful imaginings of East Coast liberals, are simple-minded guys who are too quick to reach for their six-guns. Real life cowboys were pretty good poker players. So is the Texas "cowboy" in the White House, as Democrats who were trying to take partisan political advantage of Sept. 11 have learned to their sorrow. Bush saw them and raised them, and he's holding the aces. Bush's proposed Department of Homeland Security is the largest and most important government reorganization since Harry Truman pushed the National Security Act of 1947, which unified the military services in the Department of...