FrontPageMag is a great resource. I browse it all the time. David’s story in leaving the left is an inspiration as well.
His early bio, “Radical Son” shows how he grew up in a family of communist (say Progressive, son) school teachers, became an early icon of the left and then slowly and finally saw them for what they were. He is my generation’s Whittaker Chambers.
I have a signed copy of Radical Son around here somewhere.....