Obama was an unusually charismatic candidate who got 93% of the Black vote in 2012 and 96% in 2008. There is no way Hillary or any other democratic candidate could match that. Hispanic turnout did turn out a bit below expectations, but not by much. Note that Hillary got completely crushed in the "White w/o college degree" category, which is a much larger demographic.

And despite that Hillary still won the popular vote by 3 million votes. She did pretty well across the board and in an election as close as this one almost any single thing could have flipped the outcome.