I don't think that really contradicts what I said. Social attitudes change over time; that's not in dispute. The US is still pretty racist, but has gotten less racist over time. I think things like that absolutely are causes for idealism.

But Obama was still one of a very few options Americans had the opportunity to elect. He ended up in the primaries largely without the involvement of the vast majority of the country. My point isn't that things don't get better, just that we don't get a lot of choices, politically.

(Though if Trump wins this fall, and the right succeeds in their plans for their government "makeover", I think that will set back the "things getting better" train for decades. Hell, our hard-right SCOTUS majority is already unraveling that.)