I always felt like Former Hope's vote switching was just enjoying messing with people, but then DS. got on his nerves too much.
bluedoom, to explain why I think one of them is a mafia, I see two situations that seem very likely to me:
1.) DS. is mafia and hiding it under her aggressive personality. She is trying to provoke the crowd into feeling like there are only two options, Former Hope or DS., and then convince people to her side. If this is the case, it would be an extremely effective but dangerous strategy. In this case, Former Hope's actions would be mostly out of defense, and his vote switching would be him just enjoying messing around with people.
2.) Former Hope is mafia and hiding it under his enjoyment of messing with people. DS. is trying to provoke the crowd into feeling like there are only two options, Former Hope or DS., and then convince people to her vote. This would make for a very influential voter.
I feel like case 2 is a little more likely, simply due to the quantity of Former Hope's joking actions. He may be trying to play himself off as natural, and thus exaggerates his personality by accident. He becomes defensive against DS. calling him out, but still maintains his joking style.
I may be wrong, but I feel like our best option right now is to lynch one of them.