It appears they do, according to a new paper soon to be published by the American Economic Journal: Applied Economics.

…. the grading distribution for Democratic professors is relatively flat, meaning there was little variety in grades assigned to students with different SAT scores. The Republican line is steeper, meaning that Republicans had more variance in their grading: They gave both more A’s and more D’s than Democrats did; Democrats tend to give a lot of B’s.

Republicans (hmmm…) also tended to grade black students much more harshly than Democrats did.

But whether Democrat or Republican, our members of Congress consistently beat the stock market, according to a new analysis. Senators, for example, tend to beat the stock market by an average 10 percent over the last two decades.

Why? Probably because of their access to insider information…