front-runner, he is leading the way. it is that race between bernie sanders and elizabeth warren that is and matiimating and div democrats. elizabeth warren has been encroaching on senator sanders, eating into some of his support. we'll see how the audience receives his message. he has shis staunch supporters here but others do believe he's not a true democrat. it always been his challenge. we'll see how this plays out. >> is this also kind of a microcosm of an identity shift of the democratic party? >> well, there's no doubt the democratic party has shifted more toward the left, more progressive, really campaign by campaign. senator sanders in many ways has been leading that charge. many of the issues he put