Joe Biden has made another gaffe. On Saturday, the American president delivered a speech to the Congressional Black Congress in Washington, D.C., where LL Cool J and MC Lyte were both present to receive awards. [readmore label="READ MORE: " link="https://etcanada.com/news/1003418/joe-biden-to-meet-king-charles-at-windsor-castle-after-skipping-coronation/" /] But when it came time to talk about the two artists, Biden ended up…