There it is again - conservatives are dummies.
“A lower rate of college educated adults”
Yes, they imply that it means conservatives are less intelligent than liberal voters. But, it is just as logical to interpret it as conservatives are less indoctrinated and brain-washed by the so-called intellectual leftists at the universities. In other words, conservatives are more independent thinking and less inclined to be led around by a the nose.
that should read “college-indoctrinated”