Sanders vows to fight until convention
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Bernie SandersBernard (Bernie) SandersMellman: On Political Authenticity (Part 2) Former Sanders campaign manager: Don't expect email list to be shared with DNC Adult film star: Trump and Stormy Daniels invited me to 'hang out' MORE early Wednesday insisted that he will continue to campaign for the Democratic presidential nomination until the party's convention in July despite narrowed prospects.

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"I congratulate Secretary Clinton on her victories on Tuesday. I also want to thank the millions of voters across the nation who supported our campaign and elected delegates who will take us all the way to the Democratic National Convention in Philadelphia," Sanders said in a statement.

“With more than half the delegates yet to be chosen and a calendar that favors us in the weeks and months to come, we remain confident that our campaign is on a path to win the nomination.”

Clinton on Tuesday picked up four wins in Florida, Ohio, Illinois and North Carolina, with results in Missouri too close to call early Wednesday.

She's added to her significant delegate lead, leading Sanders by about 300 pledged delegates, 1,132 to 818, according to The Associated Press.

“We think it would be very difficult, if not impossible, for him to overtake her at this point,” Clinton spokeswoman Jennifer Palmieri said on CNN.

Still, some expect Sanders to stay in the race in an effort to further influence the eventual Democratic nominee, pushing Clinton into the summer.

"I don't expect him to drop out. He has every right to stay in," Sen. Sherrod BrownSherrod Campbell BrownSenate campaign fundraising reports roll in Commerce sends Trump long-awaited steel report GOP Rep. Jim Renacci announces Ohio Senate bid MORE (D-Ohio), who's been mentioned as a possible vice presidential pick for Clinton, said on CNN's "New Day."