Story highlights Bernie Sanders vowed Sunday to stay in the Democratic race

Sanders said his criticism of Hillary Clinton isn't meant to help Donald Trump

Washington (CNN) Bernie Sanders said at a Sunday news conference that he faces "a tough road to climb, but not an impossible road to climb" to win the Democratic presidential nomination.

Sanders made clear, yet again, he has no plans to get out of the race against Hillary Clinton before all the votes are cast in June. But he proceeded to make the argument that superdelegates from states he won should back him.

"Those superdelegates in states where either candidate has won landslide victories ought to seriously reflect on whether they should cast their superdelegate vote in line with the wishes of the people in their states," Sanders said.

Of course, even if the Democratic officials from New Hampshire, Minnesota, Washington state and others decided to back him, the math still doesn't work in his favor -- and he didn't sugarcoat that fact.

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