Death penalty for terrorists?

The government is set to try–finally!–the worst of the terrorists in Guantanamo and will seek the death penalty for six individuals, including the mastermind of the 9/11 attacks. See

this.

I’d like to hear whether Senators Clinton and Obama will seek the death penalty against these guys.

Do you really think they will be executed? Or will these trials by military tribunal end up putting America on trial before the world for Guantanamo, the war in Iraq, waterboarding, etc., etc.?