Charles M. Blow: Black power, now or never

It is easy to believe that Black power and influence is growing in America, and that the logical conclusion is that a set of policies favoring the Black community in America — a so-called Black agenda — is growing more likely as the years pass and the percentage of nonwhite Americans rises.This election alone, the vice president is a first in several ways — not only the first Black person in that role, but also the first woman and the first person of South Asian descent.Black p