2,026 “hard” delegates are needed to be clearly/mathematically certain of winning the nomination. Clinton has only 609 now. Even if she won every single “hard” delegate from every subsequent primary, it’s mathematically impossible for Clinton to reach that number until the New York primary on April 19th. And since these delegates are assigned via proportional representation, it’s exceedingly unlikely that Clinton could win every single “hard” delegate — and highly probable that neither Clinton nor Sanders will reach 2,026 “hard” delegates before June 7th.
See projects.fivethirtyeight.com/…
(This post was updated to correct the “earliest possible date” value, originally stated as June 7th.)