Barnabas would go McCain because of the military connection and the fact his family fought in the Revolutionary War. Come to think of it, doesn't that make him a citizen? He may have claimed to have been from England, but we all know that wasn't true. He was American.
That reasoning doesn't fit. After all, Elizabeth was a woman and she was the one who had been in charge all along.
Of course Roger did mellow out in time, so who knows? Maybe his rather sexist beliefs did disappear in time and he developed more modern views.