FILE - John Heilemann attends the premiere of the Showtime limited series "The Loudest Voice" in New York on June 24, 2019. (Photo by Evan Agostini/Invision/AP, File)NEW YORK – The co-author of the million-selling “Game Change” has a book of his own coming about the 2020 election. Heilemann had collaborated with Mark Halperin on “Game Change,” about the 2008 race, and on “Double Down,” about 2012. The HBO adaptation of "Game Change" won five Emmys and three Golden Globe awards. Heilemann is national affairs analyst for NBC News and MSNBC and co-founder of the political video platform The Recount.