I just hope this mass psychosis is temporary but I'm having my doubts.
Unfortunately, I have reached the same impasse with my vehemently ABB father. We have recently had to agree to never discuss politics. More precisely, he has decided that he can't discuss politics with me. I have never seen such anger in him as I have recently. I just don't get it.
You should both print this out now and give a copy to your friend and father after the election. At that point they may be in the proper frame of mind to see the light.