I would say manipulating the intel to lie to Congress and America about a war that never should have been waged and has been grossly mishandled would qualify. Also, his secret energy deals with BigOil and other hush hush biz with major corporations, taking our national lands and selling them or leasing them for a song would likewise qualify.
Goodbye, Cheney, you are history and when you're impeached there will be no good words for you unless you immediately change your destructive, stupid and many would say evil ways. I cannot wait until you are gone. Let it be well before 2008.