Well, according to the majority, Marty McFly is the most likely candidate to have to go back in time and a kill a person to prevent a future apocalypse. I think you're all missing the boat Barack Obama, but that's just one man's opinion.
I bet Barack would do his killing with a silent stoicism that portrays the gravity and necessity of the situation instead of a scene playing out like this:
Marty: "Geeze, Doc, I can't believe I just killed a guy!"
Doc: "Great Scott, Marty! What you've done is unforgivable. But I suppose you can't make an omelette without breaking a few eggs. Unless it's with my new invention! The auto-omlettifyer! But to make it work, you need high grade nitro-glycerin.
Marty: "Geeze, Doc, we better find that nitro-glycerin. I'm craving some omelettes. But first, let's pour some manure on this dead guy!"
Doc: "F*$% YEAH!!!!"
Anyway, it's time for a new poll, and I think this picture speaks for itself:
In case your wondering, Mrs. Dr. Bitz FORCES me to watch Top Chef. It ain't voluntary. But that picture is all I can think of when I watch it...
Voting to your left!