Former White House press secretary and FOX News commentator Tony Snow is joining CNN. He'll be a conservative commentator for the news network. He was actually on the network before, as a fill-in host on Crossfire. But then he went to FOX News, where he hosted FOX News Sunday from 1996 to 2003. He was also a speech writer for the first President Bush.

Anchors and pundits change networks all of the time, but one of the reasons that this is a little surprising is that Snow is currently a substitute host on Bill O'Reilly's Radio Factor radio show on the FOX Radio Network. I would have to assume that he will no longer have that role (O'Reilly once warned him about going to CNN).

Snow was treated for cancer twice, once for colon cancer in 2005 and then again last year, when he had surgery to remove a growth. He left his position as White House press secretary in 2007 not because of the cancer but because he wasn't making enough money. He is also reportedly working on a book.