Now this is my kind of poster (click on the image for a PDF version):
But there are a couple things I would change.
The poster drastically underestimates the number of people murdered by governments in the 20th century, which is closer to 170 million than the paltry 58 million claimed here (the Soviet Union and Communist China together easily eclipsed that figure).
And, of course, lumping in Bill Clinton with three of the worst dictators in human history is beyond absurd. I’d put a murderous dictator who is currently in that fourth spot like Saddam Hussein (I can think of better choices, but he’s the only one that the average American would recognize).