Apparently, many libs. Playwright David Mamet was an arch-lib for many years and mentioned Sowell as one of the key figures in his transformation from liberal to conservative. I'll bet millions of libs read Sowell's columns and deep down know he's right. But many of them don't have the integrity to admit they wrong, like Mamet did, and change.
Good points but if they're reading him and know he's right I'd say they were already in a state of transition.