- Julian Zelizer: Even without nomination Sanders campaign could change Democratic Party long-term
- He says he's flipped script on campaign funding, trade, Israel, won grass roots; things won't be the same again
Julian Zelizer is a professor of history and public affairs at Princeton University and a New America fellow. He is the author of "Jimmy Carter" and "The Fierce Urgency of Now: Lyndon Johnson, Congress, and the Battle for the Great Society." The opinions expressed in this commentary are his.
(CNN)With Hillary Clinton's decisive victories in four of the five primary states Tuesday, the math almost certainly won't work for Bernie Sanders. With the results of the most recent primaries, the time has come for Sanders to start winding down his campaign and thinking about what role he can play in the Democratic battle for the White House.