Obama did exactly what Hillary said he would do. You do not govern as a visionary. The act of governing requires realistic expectations and goals. A lot of Obama's supporters simply didn't understand the nuances of how things get done. I see a lot of Sanders supporters saying the exact same things. This time, though, it will be different, because reasons. The second a hypothetical President Sanders agrees to a $10 minimum wage instead of a $15 minimum wage, some of his supporters will freak the hell out.
It seems to me as though the argument has shifted from what we can realistically hope to achieve to "Well, the GOP is going to be assholes, so let's pretend like we can get everything we've ever wanted because why the hell not?" That's not how it works. I honestly don't know what the GOP wants anymore. I don't think they know what they want anymore either.