For 2016, Texas, Florida, and New York are included but California is not because Hillary Clinton had already secured the nomination by the time California’s Democrat primary voters had their day. Figures for the Iowa and Nevada caucuses are very conservatively estimated, at 20 times and twice the delegates awarded, respectively:
In 2008, Clinton handily won whites and Hispanics but got clobbered among blacks and so lost the nomination. Having learned in defeat that the key to securing the Democrat nomination is getting the monolithic black vote, Clinton pandered to and mobilized urban Democrat political machines across the country to shut Bernie Sanders out. Owning the superdelegates was just a gratuitous insurance policy.
The Democrat party is the Black Party now. A lot of white people have yet to come to terms with it, even on the left, but they will. Despite polls showing Biden, Clinton, Sanders, and Warren as the top contenders for 2020–with non-whites all in the single digits, it will be Kamala Harris, Deval Patrick, or maybe even Cory Booker.
In The Current Year, blacks vote overwhelmingly for black Democrat candidates and SWPLs refuse to correspondingly vote overwhelmingly against black Democrat candidates. Ergo, if at least one black candidate runs, a black candidate will win. It doesn’t matter if the candidates in question are less than fully black, black is the identifier that earns the most Diversity! points so any candidate who has some African ancestry leverage it to the hilt.