Shorter Charles Blow: the fact that liberals make up 40% of the Democratic Party is worrisome, though it's not a problem at all that the GOP is 80% wingnut.
The charts Blow points to indicate that the Democratic Party is 40% liberal, 40% moderate, and around 20% conservative. On the flip side, the GOP is 75% conservative, 20% moderate, and around 5% liberal.
So one party has mostly purged just about everyone but it's ideological root, and another party still is comprised of 40% self-identified moderates.
But Democrats have a liberal problem!
What an assclown.