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What Sanders supporters don't get is that the President doesn't get a magic wand.
No, but he does get the best bully pulpit in the world. He also gets executive orders, SCOTUS nominations, and a powerful executive branch. That ain't a magic wand, but it's also not chopped liver.
I have mixed feelings between Sanders and Clinton. Clinton certainly has superior experience, especially re. foreign policy. She also has deep establishment support that will help her with Congressional Democrats. On the down side, she's too hawkish, too cozy with Wall Street, and her character is deficient, to put it mildly.
Sanders, in contrast, has a much better vision than Clinton. For health care, he wants to pull America forward to match all of our first-world peers. That's the right goal, and it's disheartening to hear Clinton insist it isn't even worth considering.
Can we get there with our current corrupt Congress, beholden to insurers and big pharma? Probably not, though Sanders will have his bully pulpit to get Americans on board. He also has an advantage over Obama in that, first, Obama broke the ice on providing some sort of national health care, and second, most people recognize the ACA needs to be improved dramatically. Is that enough to get Sanders' plan passed? It's a long shot, to be sure. If nothing else, Sanders can plant seeds that will eventually grow into a proper universal health care system for America.
Of course health care isn't Sanders' only issue. He's also a strong advocate for getting the money out of politics. I think he has a better chance of making progress here. Even many Republicans recognize how money is corrupting our political system; note Trump's success selling that same message. I have hope that Sanders could make headway here, by rallying bipartisan support from the American people.
The other big issue where Sanders has the definite advantage for me is military restraint. Yes, Clinton has much greater foreign policy experience. but it's not necessarily experience I agree with. She's far too eager to embroil us in questionable "wars". Sanders clearly has a much different, and IMO better approach.
Overall, I'm leaning Sanders. I do see that both Clinton and Sanders have strengths and weaknesses. I don't see any Republicans I'm inclined to support. I was intrigued by Kasich initially, in spite of occasional dumb remarks. (Eliminating teacher lounges will help fix our education problems? Really?) I recently talked with a group of Ohio folks, Republicans and Democrats. When politics came up, I asked about Kasich since no one mentioned him. They all disliked him and said he's been bad for Ohio. The consensus was that he's a very polished politician, but a phony they don't trust.