'Abraham Lincoln: Vampire Hunter' Star Jimmi Simpson -- Who's the Better Vamp Killer ... Obama or Romney???

'Abe Lincoln: Vamp Hunter' Star OBAMA VS. ROMNEY Who's a Better Vamp Killer?

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"Abraham Lincoln: Vampire Hunter" star Jimmi Simpson has solved the greatest political debate of our time ... WHO WOULD MAKE A BETTER VAMPIRE SLAYER -- Barack Obama or Mitt Romney???

The actor -- who also plays one of the McPoyle bros in "Always Sunny in Philadelphia" -- was leaving the Ritz-Carlton in NYC Monday ... when we asked him the one question weighing on everyone's minds this election season.

His answer's pretty crazy -- but he does make a damn good point when it comes to vampires ... and Presidents.