Pressure is mounting on Bernie Sanders to end his campaign for the Democratic nomination and allow frontrunner Hillary Clinton to focus on battling Donald Trump in the general election.
But even after losing four out of five of Tuesday’s primaries, there is no evidence the Vermont senator intends to do so, or even that his supporters would automatically back Ms Clinton.
On Tuesday, Ms Clinton won Pennsylvania, Connecticut, Delaware and Maryland and took her delegate haul to 1,640, compared to Mr Sanders’ 1,331. He won just one state, Rhode Island.
Before the results came in, the 74-year-old had insisted he still had a “narrow” if unlikely path to securing the party’s nomination ahead of the convention in July.
But in a statement issued after the night’s figures emerged, his tone had shifted, even if he suggested he was going to stay in the race until the final primaries in June.
“I congratulate Secretary Clinton on her victories tonight, and I look forward to issue-oriented campaigns in the 14 contests to come,” he said.
“The people in every state in this country should have the right to determine who they want as president and what the agenda of the Democratic Party should be. That’s why we are in this race until the last vote is cast. That is why this campaign is going to the Democratic National Convention in Philadelphia with as many delegates as possible to fight for a progressive party platform.”