Sanders vows to fight until convention
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Bernie SandersBernie SandersVoter fraud allegations reignite squabble Mulvaney vows to give Trump straight talk on entitlements Senate confirms Trump's UN ambassador 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 BrownWounded Price heads toward confirmation Schumer to Trump: Work with Democrats on infrastructure bill Senate committee clears Carson nomination MORE (D-Ohio), who's been mentioned as a possible vice presidential pick for Clinton, said on CNN's "New Day."