Definition from article:
>But the most highly educated Americans — those who have attended graduate or professional school — are starting to come together as a political bloc.
Doctors make up 1/3 of a percent of the US population (they don't necessarily have Phds)
http://www.wisegeek.org/what-percent-of-the-us-population-do...
Doctors chose Romney over Obama 55% to 36%.
http://dailycaller.com/2012/10/01/survey-doctors-choose-romn...
1.68% of Americans have a Phd (actually significantly more than I expected and significantly more than I think deserve to be handed out). I really wonder how many of these people do practical work. I can't find statistics to prove my bias so we will have to leave it as is unless someone can find some.