Richter appeared on Celebrity Jeopardy! on September 17, 2009 with Dana Delaney and Wolf Blitzer. Richter won, contributing $68,000 to St. Jude Children's Research Hospital. Blitzer, by comparison, did so poorly, that he was given money to compete in the final round. Richter's was so great in Jeopardy history that he would rank behind superstar Ken Jennings if celebrities were allowed for ranking (as it is, only "civilians" are applicable for superstar rankings).
You can watch the episode on YouTube. It is split in to two videos. It's worth watching the whole thing to see the staggering lack of knowledge on Blitzer's behalf.