Most likely if we had compulsory voting in this country, most of the plurality, who did not show up to vote, would not have voted for Trump. It may have been a scant amount, but very clearly the more eligible voters vote, it favors Democrat candidates.
I'd absolutely call it fringe. It has a very tiny base of support. It is also on the political extreme - far to the right of the mainstream.
https://www.washingtonpost.com/news/the-fix/wp/2016/11/18/10...
Outside the racism, I agree that he is very conservative, in a way that used to be fringe, which has little support now, but is widely accepted as normalized. That, I strongly feel, is a serious error by us, the public.
Edit: And there were (are?) "code words" for getting referrals. Some have even become everyday slang. But I've forgotten the specifics.
Anyway, the Trump team has now somehow made European-Americans more racist and xenophobic. They just did an outstanding job with the Wallace strategy. Wallace was appealing to blue-collar union members in the North. But now unions are largely gone, and that demographic is either unemployed, or earning minimum wage. And arguably, that has exacerbated racism and xenophobia. Pushback against globalization and the concentration of wealth.
But that is not the only factor. There are probably a dozen stewing issues and Trump managed to ride the coat tails of quite a few of them, not least of which is some people who didn't want Trump president couldn't be bothered to show up and vote. There's a roughly 8 million voter gap between 2012 and 2016.