As a trend, the more educated you are, the more conservative you are, up through graduate or professional degree. Obtaining a PhD reverses the trend and makes you more liberal.
Most PhD work for the government or in education and can be viewed as rent-seekers, I suppose. Same is true for income, of course, the more you earn, the more conservative you become, or alternatively, the more conservative you are, the more you are likely to earn.
One delicious irony is that the more you know about science, the less likely you are to accept global warning alarmism.
And the same for Darwinism. See tagline.
FReegards!