Ummm…100% here.
I will freely admit that three of my answers were pretty much SWAGs that I got right.
Crap. 70%. My excuse is that I never took a history, civics, or econ class in my life.
Everything I know about those topics, I’ve learned here on the Dope. You guys must be doing a piss-poor job of teaching me if I only got 70%!* 
*For the humor impaired, I know I have only myself to blame for not knowing more.
95%. The ones I missed were #23, #58, and #60.
I got more right than I got wrong. 
44 out of 60. 73.33%
I would like to say that I bombed one particular area but in reality, my ignorance spans a great many topics. I graduated high school in 1996, and I’m a part time engineering student now. I really should have done better. I think I’ll take a history course this summer to make up for my poor showing.
In my defense, civics bores the hell out of me. I really honestly could care less when Jamestown was founded, etc. How about something practical?
46 out of 60 = 76.67%
That works out to a C+. At least that’s a passing grade. Take that, Harvard. 
(Says the guy who went to a State Uni.)
93.33%… Not bad for an old fart who hasn’t had a Civics class in the last 30 years.
I got a 90. I am so smart! I am so smart! S-M-R-T! I mean, S-M-A-R-T!
“Smrt” means “death” in Czech.
70%. In your face, Plato! I’ll join the dumbass bench, and would like to say that my eyes glaze over whenever I see dates, but that I instantly knew when Lincoln was elected from watching Bill & Ted’s Excellent Adventure!
“You answered 49 out of 60 correctly — 81.67 %”
I’m amazed. The finer aspects of politics and history have never been my strong point. I guessed a lot.
90%
I missed just war also, and who the heck is Alexis de Tocqueville?
Short answer: A European historian and philosopher, who wrote perhaps the first positive description of life in the Americas. Rather than condemning the society for not being carbon copies of European societies.
Long answer, take a look a this Wikipedia article.
ETA: Longest answer: Read Democracy in American, available here. I’ve found it to be one of the more readable works from that time frame.
You answered 60 out of 60 correctly — 100.00 %
Average score for this quiz during April: 66.7%
Average score since September 18, 2007: 66.7%
One unexpected advantage was that I read several posts before I took the test. While people were kind enough not to post the answer, just knowing which problems were hard turned out to be an advantage. I would read a question and think, that is one that stumped people-better stop and think about this one. Nevertheless, I didn’t find the test that hard. Nothing like graduating from High School in Iowa in 1893-has anyone seen that test? It is circulating on the internet-I’m an oceanographer and had to read the question about the Gulf Stream carefully to get the correct answer. This is a test to graduate from high school in Iowa and they needed to know how the Gulf Stream works. That was a challenging test.
46 out of 60 — 76.67 %
Now I feel a bit inferior (to Dopers at least), but not so much to Harvard grads. I’m actually quite proud to be rubbing virtual elbows with the likes of you folks. Although now I figure I should just shut up and stick to MPSIMS. 
That being said in my particular demographic, I think I did respectably well: Highest academic achievement, high school; personal annual income, <$24,999 (hopefully this is just temporary, of course). Oh, and for statistical comparison, I graduated high school in 1988.
Is there a bench then for average achievers?
ETA here’s what I missed:
It’s the one behind the Group W bench. 
You are a Doper after my own heart. 
Is this the test? This one is 1895 and Kansas, but it’s in several forms on the Internet. If so, it is an Urban Legend, at least in terms of it being proof of declining educational standards.
85% — tolerable for an old social sciences person, not as good as I should’ve gotten.
Financial theory is my weak point.