The only celebs on that video I've even heard of were Sally Field (Uber- has- been, 'Lincoln' was the first decent movie she's done since the early 90s), Steve Buscemi (Kind of cool actor but also a has- been, the only big movies he's been in since the early 2000s were the 'Hotel Transylvania' films and the crappy 'Monsters Inc.' prequel three years ago), and Jeffrey Wright (The only roles of his I recall were as the villain in the 2000 'Shaft' movie, and his honestly rather forgettable performance as Beetee in the 'Hunger Games' films).
Gotta love how a bunch of pretentious, uber- wealthy Hollywood celebrities completely out of touch with regular Americans (Whom they, like most liberal elitists, view as a bunch of illiterate, inbred rednecks) end that little video with "Signed, the majority of the American people."