I didn’t see the Myttrom Knee interview this morning, so I’m reading the transcript now. This part is interesting:

Stephanopoulos: You were joking in St. Louis the other day that what sets your husband apart in this field is he hasn’t been divorced.
Both John McCain and Rudy Giuliani have been divorced. Is that something voters should take into account?
Ann Romney: I was really joking about just the Mormon thing and only having one wife.
Mitt Romney: This is a Cato Byrne joke. Cato Byrne wrote that joke and when you start a speech, you’re always looking for something funny to say and she quoted that joke that she put forward.

I just can’t figure out who this “Cato Byrne” character is.