The widow of the late Sen. John McCain talks to "GMA" about her decision as a prominent Republican to back the former Democratic vice president in 2020. Subscribe to GMA's YouTube page: https://bit.ly/2Zq0dU5 Visit Good Morning America's homepage: https://www.goodmorningamerica.com/ Follow GMA: Facebook: https://www.facebook.com/GoodMorningAmerica Twitter: https://twitter.com/gma Instagram: https://instagram.com/goodmorningamerica Watch full episodes of GMA: http://abc.go.com/shows/good-morning-america https://hulu.tv/2YnifTH #GMA #CindyMcCain #BidenHarris2020 #GOP #JohnMcCain #Politics