"In God We Trust" –  that's what it says on our greenbacks. It's the national motto and on Tuesday, the House  voted  to  reaffirm the motto. Virginia Congressman J. Randy Forbes, the man who sponsored the bill, says that this vote is to "directly confront a disturbing trend of inaccuracies and omissions, misunderstandings of church and state, rogue court challenges, and efforts to remove God from the public domain."  There are about five Democrats who have challenged the bill, but everyone else seems to be pretty much on board. But what is the history of the national motto? Kenneth C. Davis, the author of "Don't Know Much About History," explains.