

I think that’s exactly what David Hogg is doing with his primary challenges to moderate Democrats in safe blue seats. It makes no sense for one party to be moderately left when the other party is hard right, regardless of how toxic the political environment is going to be. If you only really have two parties, they have to both occupy the center (pre-1970) or both be somewhat ideological.
Technically it’s only regular pentagons that don’t tile the plane.
I know everything about planes because I am shorter than my brothers. When we were young, they called me Tattoo and if I pointed at something with my finger, they screamed in unison, “Da plane! Da plane!”