Roman Emperors Were More Likely To Be Assasinated/Executed Than To Die Naturally

Of America's 44 presidents, 14 have survived assassination attempts and 4 have succumbed.

http://en.wikipedia.org/wiki/List_of_United_States_presidential_assassination_attempts_and_plots

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The midterms were exhausting, but keep in mind that the only real alternative to holding elections is a political system that relies on assassinations, coups and civil wars. Roman emperors were more likely to be assassinated or executed than to die of natural causes, a sharp contrast with U.S. presidents. Orderly, nonviolent transitions of power are better for everyone, politicians especially. Zack Beauchamp at Vox