> The extreme right did learn one thing: no matter how different many are (blue dog all the way to tea partier), they don't oust you for having different beliefs within their continuum.

You might be forgetting/not aware of the terms 'RINO', or more recently: 'Cuckservative' which are used by the right to disparage others on their continuum. Politics is getting more polarized on the left and the right. See also: recent Freedom Caucus actions.