Mr. Sanders’s push for superdelegates comes as he fights to remain viable after a string of losses last week and a sharp drop in fundraising in April. Mr. Sanders has the support of 39 superdelegates, while 520 have said they will support Mrs. Clinton. She also leads him in pledged delegates, 1,663 to 1,367, giving her a total lead of 2,183 to 1,406. It takes 2,383 total delegates to secure the nomination.
Mr. Sanders expressed frustration that Mrs. Clinton had won superdelegates even in states where he won the primary. In Washington State, where he won almost 73 percent of the vote, Mrs. Clinton has 10 superdelegates while he has none. In Colorado, Mr. Sanders won 59 percent of the vote, but again Mrs. Clinton has 10 superdelegates from that state and he has none. Sanders aides handed out a list showing similar situations in states like New Hampshire, Kansas and Maine where he won more votes but has fewer superdelegates than his rival.
“If I win a state with 70 percent of the vote, you know what? I think I am entitled to those superdelegates,” Mr. Sanders said. “I think the superdelegates should reflect what the people of the state want, and that’s true for Hillary Clinton as well.”