Sen. John McCain, R-Ariz., right, gets the endorsement of one-time challenger Sen. Sam Brownback, R-Kan., left, on Wednesday, November 7, 2007 in Dubuque, Iowa. McCain and Brownback differ sharply on whether war-on-terror captives at Guantánamo should be moved to Fort Leavenworth, Kan. McCain supports the idea. Brownback opposes it. JEREMY PORTJE / ASSOCIATED PRESS

This 2003 Army image shows the United States Disciplinary Barracks, the military's then-new maximum-security prison on the north edge of Fort Leavenworth, Kan. The brick and glass structure building looks more like an office building than a maximum security prison. ASSOCIATED PRESS