You believe that the GOP represents an "unhinged minority"? I don't think that is true. Or rather, I think that there are many, maybe even the majority, who aren't well represented by either party. The current Democrat regime is all about deregulation, privatization, anti-labor and ceding wealth to Wall Street. By "Wall Street", I don't refer to the financial sector. Consumer finance, life insurance, small business banking, accountants and actuaries do productive work and contribute positively to the economy. Most of Wall Street isn't even Wall Street any longer, just a few massive investment banks, private equity partnerships, hedge funds and Carl Icahn-types. All of Obama's second term cabinet members are scions of very wealthy families, his ambassadorial appointments were chosen from financiers who were major campaign contributors, with zero diplomatic experience. It wasn't like this in 2008, but it is now. They call themselves Democrats, but they are more venal and corrupt, in terms of (selectively) favoring big business and other special interests than we've had in a long time.
The GOP has not offered an appealing alternative, though they would be wise to try.
One could just as easily say, "If the Democrat Party wins, then American democracy loses". Everyone loses if we have one-party rule.