A defiant Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE told supporters on Tuesday night that he can still overtake Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE in delegates, and pledged to take the fight all the way to the convention in Philadelphia this summer.

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Speaking at a rally in Southern California just minutes after suffering a narrow defeat to Clinton in Kentucky, Sanders declared that he’s going all-in “until the last ballot is cast” in the Washington, D.C., primary on June 14.

“We have the possibility, it will be a steep climb, I recognize that, but we have the possibility of going to Philadelphia with a majority of pledged delegates,” Sanders said to the huge crowd that gathered to see him in Carson, Calif.

“Now some people say we’ve got a steep hill to climb and that’s absolutely true,” he continued. “But together we’ve been climbing that steep hill from day one in this campaign and we’ll continue to fight for every last vote until June 14, and then we’ll take our fight into the convention.”

Sanders is running out of time and needs to win by huge margins in the remaining contests if he’s going to catch Clinton. Even if he does, Sanders will then have to convince the super-delegates who have long supported Clinton to back him instead.

On Tuesday night, Clinton edged Sanders in Kentucky, although the two will essentially split the delegates there.

Sanders blamed the loss on the closed primary there that prevents independents from voting, and noted that Clinton defeated then-Sen. Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE by 250,000 votes there in 2008.

Sanders won in Oregon, but he likely won’t have cut too deeply into Clinton’s lead by the end of the night.

He entered election day trailing by nearly 300 unpledged delegates and will need to take more than 60 percent support in the remaining contests if he’s going to catch Clinton.

But Sanders on Tuesday kept his sights on the front-runner.

“Before we will have the opportunity to defeat Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, we’re going to have to defeat Secretary Clinton,” he said.

Sanders then ticked through a handful of issues where he and Clinton differ, noting that he doesn’t rely on super-PACs or Wall Street money.

He also dinged Clinton for voting to authorize war in Iraq, and argued that only he supports a higher minimum wage than she does and a tax on carbon.

— This post was updated at 12:05 a.m.