Democratic dependence on nonwhites proven by Obama, Clinton

ATLANTA (AP) — Eight years ago, exit polls showed Hillary Clinton with comfortable margins over now-President Barack Obama among whites and Latinos during the Democratic primary season.
This year, exit polls of Democratic voters showed whites narrowly preferred Vermont Sen. Bernie Sanders. Yet, Clinton is the presumptive 2016 Democratic nominee.
The key difference: African-Americans sided overwhelmingly with the winner of 2008 and 2016 nominations, with black voters across the South and in