I saw the "con" part of the debate, an interview with a spokeswoman for the Texas Eagle Forum. The host, Tom Spencer, was excellent. However, by the end of the interview he seemed like he was about to explode. There's not really much one can say when one's interviewee has jumped back to a previous argument after the others were shot down.

Her repeated argument ("marriage laws are equal for everyone") wasn't shot down because it doesn't make any sense.