Jim Carrey has found his latest role for 2020: Joe Biden.“The Mask” and “Ace Ventura” star, 58, who has long been beloved by audiences, was tapped by NBC to play the Democratic presidential nominee, 77, throughout Season 46 of “Saturday Night Live.”“There was some interest on his part,” Lorne Michaels, who helms “SNL,” told Vulture. “And then we responded, obviously, positively.