[OldDeckHand]

30/30 - although, I had to guess on the number of Presidents assassinated. I couldn’t only count three - Lincoln, Garfield, Kennedy. Since three wasn’t an option, I went with 4, although I can’t for the life of me think who the fourth was.

[houeto]

McKinley

I had to look it up.

[The Pack Knight]

James Taranto used to post some very difficult Presidential history quizzes on opinionjournal.com. Here's one of them - a relatively easy one compared to the others I remember, actually.

http://www.opinionjournal.com/best/?id=110008354

[davius]

McKinley. 30/30.