Hillary hasn't even gotten out the Obama base. Just like in the Romney election, I was very clear to Romney supporters - "Obama is going to lose voters, but that doesn't mean that Romney is going to win. Romney still has to turn out the Republican base." Sure enough, that's exactly what happened. Romney lost voters from McCain and the Republicans lost even though Obama did much more poorly in 2012 than in 2008.
I see the same happening with Hillary. Hillary loses voters over Obama, and Trump loses because the GOP base refuses to vote for him.
Honestly, I don't see why Democrats are crowing about a demographic 'realignment' when the 2012 numbers were lower than the 2008 numbers.
Hillary is without a doubt improving with female voters, especially female voters with college degrees (If Hillary wins a landslide...it will be because of this group).
Sure, she'll drop in the AA vote a smidge, but that's kinda to be expected.
Trump is digging his own grave with hispanics, but still I don't see her "losing" anything there.
What else is there that's the "Obama base"?