The President of the United States, having noticed that the illegal-immigrant issue has rent asunder both the nation at large and his own core constituency, proposes now to dispatch 6,000 National Guard troops to the Mexican border, thereat to provide temporary backup to an overwhelmed Border Patrol in stanching the flow of interlopers currently interloping unchecked. Millions of Americans approve and applaud, as they surely will also cheer the rest of the border-tightening plans Bush outlined in prime time last night: a bigger civilian Border Patrol to allow the troops to resume other duties, security fences to seal the line,...