Vermont Senator Bernie Sanders won Tuesday's presidential primary in West Virginia, making a small gain in his delegate deficit as he again vowed to battle former Secretary of State Hillary Clinton until the end.
Sanders won 51 percent of the vote with Clinton getting 36 percent. The proportional system used by Democrats to allocate delegates means Sanders will get at least 16 delegates while Clinton will still get 11.
She leads the overall count 2,239 to 1,469 when counting the so-called super delegates who have pledged to support her. A Democrat needs 2,383 to clinch the party's nomination at its July convention in Philadelphia.
Sanders told supporters Tuesday night in the western state of Oregon, which votes next week, that he is going to "fight for every last vote" despite facing an uphill battle.
Republican presidential candidate Donald Trump gestures during a rally in Charleston, W.Va., May 5, 2016.
"We have been fighting uphill from the first day of this campaign when people considered us a fringe candidacy," Sanders said. "And our message to the Democratic delegates who will be assembling in Philadelphia is while we may have many disagreements with Secretary Clinton, there is one area we agree and that is we must defeat Donald Trump."
Trump, the only Republican left in the race, easily won Tuesday in West Virginia and in Nebraska.
His campaign issued a statement calling both wins a "great honor" and saying Trump hopes he wins both states again in the November general election.