It regretfully doesn't matter how intellectual they are if the two-party system forces them to let their anti-intellectual minorities run the party. Once a governing body decides that keeping power away from "the other team" is more important than their principles, they cease to have the merit of those principles. Middle of the road negotiation simply ceases to exist. Either you have an overwhelming majority and don't need the other party's consent, or you have a narrow majority and policy making gets held hostage by the most belligerent minority faction within the party. When that belligerent faction is anti-intellectual, the result is the current shitshow.
Since American politics are right-leaning on the Overton window, that makes both parties more susceptible to getting kneecapped by their most right-leaning belligerents when they hold a narrow majority. A narrow Republican majority gets kneecapped by the Freedom Caucus, and a narrow Democrat majority gets kneecapped by the likes of Sinema and Manchin.