CNN political analyst David Gergen was an adviser to Presidents Nixon, Ford, Reagan and Clinton. He joins us to discuss the 2016 presidential race, including why, or perhaps how, Donald Trump can be holding the lead in Republican polls, the on-going political gridlock over the Iran deal and more.
David Gergen on Political Gridlock and the 2016 Presidential Campaign
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David Gergen, professor of public service and co-director of the Center for Public Leadership at Harvard's Kennedy School of Government and senior political analyst for CNN