When pressed by Stephen Colbert about plans to run for president in 2020, Senator Bernie Sanders declines to say he is not running. Subscribe To “The Late Show” Channel HERE: http://bit.ly/ColbertYouTube For more content from “The Late Show with Stephen Colbert”, click HERE: http://bit.ly/1AKISnR Watch full episodes of “The Late Show” HERE: http://bit.ly/1Puei40 Like “The…