Here's video of the exchange (Constitution stuff starts at 2:37):
O'Donnell, of course, has a long history of supporting creationism as a valid scientific theory. In 1998 appearance on Bill Maher's Politically Incorrect, O'Donnell called evolution "a myth."
Here's what that looked like:
Back at her Oct. 12 debate with Coons on CNN, O'Donnell said that localities should determine whether evolution is part of the curriculum in public schools. She was less willing to dismiss evolution as a concept than she was in 1998, however.
"What I believe isn't relevant," O'Donnell said in the debate. "What I will support in Washington D.C. is the ability for the local school system to decide what is taught in their classroom."
Late Update: The Daily Caller reports that Team O'Donnell has put out a statement trying to clarify her comments.
"In this morning's WDEL debate, Christine O'Donnell was not questioning the concept of separation of church and state as subsequently established by the courts," said campaign manager Matt Moran. "She simply made the point that the phrase appears nowhere in the Constitution."