No, what is unprecedented is a Republican party that thinks it's okay to obstruct every move a President makes just because of his skin pigmentation.
Donald Trump is the personification of that ignorance and obstruction. He should be fed to a polar bear, but instead he is being treated like a serious presidential candidate. The fact that people would vote for him just shows how many Americans hate their country and hate each other.
Yes, I agree with the first paragraph. I am a 2012 Obama voter and I agree with this.
But the personification of ignorance and obstruction is not Donald Trump. It is Ted Cruz, Mike Lee, Jason Chaffetz, and others like them. It is also folks like Paul Ryan, Lindsay Graham, John McCain, and even Susan Collins and Lisa Murkowski; folks that seek to appear to be reasonable, but are not Trump is the kind of person that would work with Democrats once the dust of 2016 settled and folks came to their senses. Whether Democrats would work with him is another issue.
He may want to, but his hands will be tied by Congress as he seeks to keep power to himself and pet issues...no different from Nixon in that regard. And he's thin-skinned enough to be embittered by being called out for that, and thus he will eventually stop wanting to.
Therefore, the only way if you actually agreed with the first paragraph is to ditch trump, go for Clinton with nose held and stop the Joe Heck's from entering and kick out the Pat Tumors, Ron Johnsons, and so on. Split-ticket voting just ain't a thing anymore.