Why Most Scientists are Liberal Democrats

According to recent surveys, only 5% of scientists profess to be
Republicans. Most of the rest claim to be liberal, rational thinking,
and well, you know, intelligent! They also tell us that the smartest
states (with the most PhD's and MS degrees) are going to be Blue.
It's the "du-u-mb" farm states and a few southerners that'll vote for
the conservatives. So what gives? Are engineers generally more
conservative than scientists because they aren't on the government
dole, I mean, government grants? Or is it just that the humanist
university is by definition, the modern temple of the other religion
that has taken over America - the naturalist - anti-supernaturalist
metaphysic?