Sanders’ campaign has long said that superdelegates represent an unfair advantage for Clinton, contrary the will of the people.

"It is unfortunate that the media, in a rush to judgement, are ignoring the Democratic National Committee's clear statement that it is wrong to count the votes of superdelegates before they actually vote at the convention this summer," Michael Briggs, Sanders campaign spokesman, said in a statement read on MSNBC. "Secretary Clinton does not have and will not have the requisite number of pledged delegates to secure the nomination. She will be dependent on superdelegates who do not vote until July 25 and who can change their minds between now and then. They include more than 400 superdelegates who endorsed Secretary Clinton before the first caucuses and primaries and long before any other candidate was in the race. Our job from now until the convention is to convince those superdelegates that Bernie is by far the strongest candidate against Donald Trump."

So Sanders could attempt to enter the convention and secure the nomination by attempting to flip superdelegates, hoping they will contradict Clinton’s overwhelming lead in the popular vote and in pledged delegates.