Put aside policy issues where we can disagree, but it seems to me that the right is starting to act in ways that are clearly insane.
The earliest example I can think of is when GW Bush nominated Harriet Miers for the Supreme Court. It was so totally out of left field. She was a competent lawyer but by no means a heavyweight. It left even his supporters scratching their heads and he was never able to give a coherent defense as to why he thought she was appropriate.
Move on to McCain selecting Palin. An older candidate with health problems selects someone who was clearly not ready to take on the Presidency. I think she may be more intelligent than people think, but she just didn’t have the grasp of history, geography, and current events that would have allowed her to take on the job of POTUS. In 2012, Herman Cain, Rick Perry, and Bachman were all seen as viable candidates. A few years ago they would have just been jokes.
Then of course there are the birthers that managed to convince a sizable number of GOP voters that Obama wasn’t a US citizen. Recently we heard from national office holders that thought women couldn’t get pregnant from “legitimate rape”.
Now we hear claims of black people being bused into Maine to vote, massive voter fraud in other states, and other wild conspiracy theories. Anyone able to look rationally at what the pools were predicting could see that the results were in line with them and we don’t need to posit a conspiracy to explain them.
Anyway, it leads to me to conclude that we are seeing batshit crazy lunacy rather than simple political disagreement. I don’t think I explained this well, but it feels very different than what I have seen in the last 40 years I have been following politics.