I would bet that there are several posters, the mittwitt bots, that paid the dollar and voted. I also would bet that there was plenty of the Mormon faith that did the same. But we do know he paid for the people in the Iowa straw poll.
As did every other candidate there. Some of them couldn't get enough bodies to come to Ames to cast the votes they were willing to spend.
I work with a good number of Mormons. They are not the type that vote en block for another “Mormon”. Maybe there are Mormons somewhere that do, but they aren’t any that I know.