“Kanye West’s announcement of his intention to seek the Presidency reminds us that it’s not too early to start thinking about the 2020 campaign. (2016’s already old hat by now, anyway),” Barry Blitt tells Françoise Mouly and Mina Kaneko. Blitt’s cover for next week’s issue, “2020 Vision,” was inspired by the historic photo of Harry Truman’s win in 1948.