Oh yeah sure, the grating and most annying voice of reason.Shasta I'll go one more higher than Tery and say that extremists on both the right and left are guilty of fear mongering as in "if you don't believe my point of view or politics, the sky is going to fall!"
I don't know how old your dad is but allow me a possible explanation. I'm 63 which makes me a baby boomer. I grew up praying in public school, climbing under my school desk in the event of a nuclear attack (a lot of good that would do :-) ) and practice evacuations to the fallout shelter. I watched the civil rights movement from the safety of my TV not really understanding the whole thing till I moved to the south (from NY) in the late sixties, early seventies.
I suppose the previous was a long winded way to say that I have seen a lot of change in my lifetime. Unfortunately, change is very scary to some people. I have had very close friends who refused to embrace computers and technology not because they weren't smart enough or capable; I opine it was simply fear or maybe denial.
America has become more diverse. I remember an advanced management class I took for a week back in 1989. One of the things we were told is that the native born, caucasian American is on the decline and in 15-20 years the person working next to us may not be a native American and English will be a second language for him/her. Boy, were they spot on.
We have also recently experienced a really bad recession, our nation is in debt, and the climate is going to hell in a hand basket. There are a lot of social issues that weren't issues 30 years ago and some of them are very devisive.
The press (name your flavor) has taken advantage of this and has both sides of many issues foaming at the mouth.
So you may have to give your dad some time to digest everything. Once the election shock wears off, he may seek an opportunity to speak to you and it may be just to rant. Consider that a debriefing of sorts because if he does rant, you will be able to read between the lines and see what his fears really are. Even if they are unreasonable to you, they may be very real to him. Hopefully the opportunity will arise where you guys can just talk.
I don't know if this was helpful or not. I have had to go through this with a few very close acquaintances. Once they settled down and realized that they were still getting up the next morning and having a cup of coffee as usual, they began to calm down. I will earnestly hope for a reconciliation.