NEW YORK — Mardi Gras is back in New Orleans. The pre-Lent festivities, canceled last year because of COVID, have resumed and the mood, while joyous, is anti-politics. Among the dozens of floats separated by marching bands and costumed knights on horseback were parodies mocking President Joe Biden, former President Donald Trump, top U.S. infectious disease expert Dr. Anthony Fauci, plus former Gov. Andrew Cuomo and his ex-CNN host brother, Chris. Mardi Gras group Krewe of Chaos seemed nicer to Biden, depicted in sunglasses with two thumbs up — and hair on his head — than to Trump, who was in a…