Blitzer asked the vice president about a statement from Focus on the Family about whether having a child outside of a married mother or father is best for the child.
Cheney said Blitzer was "out of line" even asking the question about Mary Cheney and said he fundamentally disagreed with Blitzer's perspective.
It wasn't the first time the Cheney's had treated Mary and her partner, Heather Poe, as if there was something to be embarrassed about. In the 2004 vice presidential debate, Democratic nominee John Edwards cynically tried to prod Dick Cheney into discussing how the Republicans' gay-baiting, homophobic tactics affected the Vice President's own family. Mr. Cheney would have none of it, and his wife, Lynn, came out swinging afterward (although, to be fair, it was moderator Gwen Ifill who brought the subject up in the first place).
Tune in again tomorrow.