75.76% here. I've taken a few political courses a while back so I think I had a better shot than the average bear, but honestly... I don't think many of the answers really matter.
Frankly, as long as you know the founding principals and ideals of our country then I fail to see the importance behind knowing the document in which it was written or forum in which it was said. For foreigners particularly, if not for citizenship or green cards or whatever, why should they give a care who said what and when. I imagine Thomas Jefferson means the same to them that Chairman Mao means to me... aka hardly anything.
The rest strikes me as interesting trivia and interesting history to see the circumstances in which these ideas were formed, but not necessarily important.
As long as you know 2+2=4 is it really necessary to know where you got that information?
That being said, I did trip up on some of the procedural workings of government which I do think is important to know. Olla-Wella.