[Schneed10]

It will largely depend upon the discipline in which the degree was obtained.

Obama may be leading amongst all those with post-graduate degrees. But break that down by discipline; those with MBAs I can vitrually assure will favor Republicans. Those with degrees in science and math fields will favor Democrats. Those with law degrees will favor Democrats by a pretty wide margin.

And actually a lot of that can be explained by simply following the money. MBAs work for corporations for the most part, and they tend to like lower corporate tax rates for obvious reasons. Scientific researchers depend upon federal and state funding, which Democrats tend to provide more of.