I think there is little danger of the country becoming a one party nation. Mick's letter is evidence that the light bulb is starting to come on with center/right democrats (which aren't really all that different than left/center republicans). But I question how successful a bus load of Oregon democrats showing up in Cheyenne, WY and arguing their case would be?

It seems what historically happens (without some major catastrophe; secession, depression, or major war) is that eventually a party goes too far and loses faith with the center and is rejected. Unfortunately for the nation, it looks like we may have reached the tipping point with representative democracy where folks and their elected representatives have no checks on their desires and both parties are now elected by who can promise the most and spend the most (Trump times may be different). Our next major catastrophe could be the implosion of our debt. If it happens suddenly, that's when a dictator will appear.