David Gergen, a veteran of Washington politics and an adviser to four presidents in a career spanning decades in government, academia and media, has died. He was 83.Gergen worked in the administrations of Presidents Richard Nixon,

David Gergen served as a presidential adviser to four presidents of both parties and was a longtime CNN political analyst.

He served under Nixon, Ford, Reagan and Clinton before becoming a top editor and a familiar TV pundit. “Centrism doesn’t mean splitting the difference,” he said.