ABC, CBS, and NBC all covered Joe Biden’s gaffe on Friday night, suggesting on the radio show of rapper “Charlamagne Tha God” that if you aren’t supporting him for president, “You ain’t black.” Between the three evening newscasts, there was 187 seconds of coverage, or about a minute each. ABC and CBS turned to political reporters, but NBC anchor Lester Holt dismissed the whole thing in 21 seconds.