Newt Gingrich: Kamala Harris most likely to be nominated in 2020

Former Republican congressman Newt Gingrich is weighing in on the 2020 race. The former House Speaker says he believes Senator Kamala Harris is most likely to win the Democratic nomination out of the 21 candidates running. He's also giving CBSN an inside scoop into his new book, "Collusion: A Novel."

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