CNN’s Eva McKend traveled to the Dallas convention of Alpha Kappa Alpha, the nation’s most prominent historically Black sorority organization, where Vice President Kamala Harris, herself a former member, delivered an impassioned speech warning of the dangers of former President Donald Trump. Black voters have historically been the most reliable and consistent bloc for the Democratic Party, and Biden himself secured the nomination in 2020 in large part to the backing of Rep. Jim Clyburn (D-SC), one of the most prominent figures in the Congressional Black Caucus. What McKend found was that few o…