I really appreciate the time you put into this. I disagree, but I respect your views. I really do. That said, here's an experiment: sleep on this, and then tomorrow go back and read your own post.
The reason why I'm suggesting this is because your entire post reads like an apology for Hillary Clinton. You're not posting from a position of being proud and supportive of your candidate because she represents your ideals. You're posting from a position where you think she's the best option out of bad options. You're settling.
That's kinda the persistent problem I have with Hillary. I'm tired of supporting "lesser of two evils". We've been doing that for decades and it didn't fix anything. Doing it again here would be Einstein's definition of insanity: repeating the same thing over and over and expecting different results.
As an aside, you raise a valid point about Congressional cooperation. Sure. I get it. If Sanders' supporters don't cause upheaval in Congress, he stands to get less done legislatively than Clinton. I agree with this.
What you fail to recognize, however, is that this country faces a lot of issues right now that are not legislative in nature. I worry, for instance, that Clinton's conflict-seeking foreign policy attitude will undo the normalization of relations we started with Cuba, undo nuclear progress with Iran and drag us into a ground war in Syria. I worry that she does not have the conviction to instruct the DoJ to attack state-level law enforcement and judicial corruption. I worry that she is going to keep our war on drugs going as before. I worry that she is going to retain the status quo of our financial regulatory agencies being sorely underfunded and undermanned. List goes on and on. I can in good conscience stay here and say that Sanders will not make things worse, even if Congressional obstructionism limits his forward progress. I cannot say the same for Clinton.
But back on subject of settling for the lesser evil not getting us anywhere. Bernie Sanders is a candidate I can be proud of supporting. He's the exemplar politician I wish our system was full of, and I don't mean his ideological positions (although I dig all of those too). I mean his dedication to being a public servant. I mean his honesty. I mean his ethics. I want his campaign to be a success story of not being in the pocket of special interests. I want his campaign to teach other politicians that there's another way; that it's actually legitimately possible to reach the highest office in the US without taking a penny from corporations. The public coming together and demonstrating this once to the entire political arena would have resounding effects in the way this country works for decades to come. That's worth pursuing all the way to the end, don't you think?