There are two parties with actions responsible for the scenario that we (including the Left) find ourselves. Obama & his radical attempts to alter the US & the GOP Establishment & their weakness in not being an opposition party. However; there is an upside. Any frontrunner with any buzz or charisma plus is going to be pulling up anything beneath him to a position that it wouldn’t have attained.
If you look at Trump’s credentials, comparing it to your list of required principles he’s going to come up short. But the masses don’t have lists. They listen, in the crowd with mouths agape, to that Evita, or Lenin or irrational version of bombastic Teddy Roosevelt. As long as Trump’s promises include everything on my list, then I’ll eventually support him as nominee.