Trump selected J.D. Vance as his running mate. He is not well-known. He grew up in Appalachia, and he wrote a bestseller called Hillbilly Elegy. He subsequently graduated from Yale Law School and became a hedge fund Manager.

Not so long ago, he derided Donald Trump. But subsequently, he changed his view and became a Trump fan. He didn’t just criticize Trump, he loathed him.

Rachel Maddow explains Vance’s dramatic transformation here.