After sweeping victories in three contests over the weekend, Bernie Sanders' campaign has a message for Hillary Clinton: "Reports of our death are greatly exaggerated."

Sanders campaign manager Jeff Weaver made that statement on a conference call with reporters on Monday, during which top aides argued that Sanders can still overcome Clinton's delegate lead in the Democratic primary contest. That can happen, they said, both by winning more pledged delegates and by gaining the support of more superdelegates, the 712 party leaders who are free to support the candidate of their choosing at the party's nominating convention. "We are certainly in this to win it," said Weaver, "and there is a path to do so." The crux of the campaign's argument for why it can overtake Clinton in the remaining contests is that the Sanders campaign does very well in states where it chooses to compete. The campaign was willing to write off big losses in many southern states as part of its strategy of focusing on winning a majority in as many states as possible, rather than capturing as many delegates as possible in states it wouldn't win.