Lots of thought provoking choices above.
I think mine would be
1. My Dad. He died 20 years ago - I'd like to tell him he called it on the country going to hell in a hand basket
2. Jesus - I'd like to ask him if this is really the way it was supposed to turn out, and if there is a God where the hell is he?
3. Vlad the Impaler - that's one sick SOB.
4. Martin Luther King -
5. Robert E. Lee -
6. George Washington -