Should Bush, Cheney, and Rumsfeld be executed?

Or just sentenced to life in prison for their war crimes? Namely lying about the cause of war in Iraq, saying there are non-existent Weapons of M Destruction and close ties to Al-Qaeda, both proven to be false. These lies led to the deaths of tens of thousands of Iraqis and Americans. Given the number of deaths, I favor the death penalty for them all, but is there a case to be made for simply life in prison for some reason?