This is the gist of his argument basically:
“If a man is permitted to have one wife what is to stop him from having two or even three wives?
While that argument may seem patently silly, it is parallel to the argument conservatives are making against same-sex marriages. Well, almost parallel.
The truth is a man with one wife is one wife closer to having multiple wives than a man who has no wives and a husband is to having multiple wives.”
THAT IS THE SUMMARY OF HIS ARGUMENT.
If thats the summary of his argument, he seems to take for granted that there would never be same sex polygamy. I could through that right back at him....a guy with a homo husband is closer to all male polygamy than a hetero couple.