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PHILADELPHIA — Senator Bernie Sanders and his campaign advisers plan to reassess where his candidacy stands after five states vote on Tuesday, though he is adamant that he will remain in the race until the Democratic convention this summer.

As Mr. Sanders spent the morning happily greeting voters across Philadelphia, his senior campaign strategist said the senator understood the challenges ahead and would talk with his staff on Wednesday to decide how his bid will continue. Polls show Mr. Sanders trailing Hillary Clinton in at least four of the five states voting on Tuesday — Connecticut, Maryland, Pennsylvania and Rhode Island. Still, Mr. Sanders, who visited those states and the fifth state, Delaware, is not preparing to drop out of the race but will look into how to adjust how he talks about his prospects.

“If we are sitting here and there’s no sort of mathematical way to do it, we will be upfront about that,” Tad Devine, Mr. Sanders’s senior strategist, said in an interview. “If we have a really good day, we are going to continue to talk about winning most of the pledged delegates because we will be on a path toward it. If we don’t get enough today to make it clear that we can do it by the end, it’s going to be hard to talk about it. That’s not going to be a credible path. Instead, we will talk about what we intend to do between now and the end and how we can get there.”

Before Mr. Devine’s remarks, which he made in an interview, the Sanders campaign has resisted the notion that the senator would not have a path to the nomination.

Mr. Devine explained that on Wednesday, Mr. Sanders’s senior advisers will talk about a range of issues, including how to adjust their messaging about the election process, what route if any they have to winning the nomination, and where they should focus on gaining ground. He said he could still see a mathematical path to winning the nomination, but he added that if that changed with Tuesday night’s results, the campaign would have to adjust.

“We may decide we have to pick up some more delegates in some of these caucus states,” Mr. Devine said. “Maybe we have to get some more people on the ground between now and the state conventions some place because we are not going to win as many as we thought we were going to win in primaries. But we have got to make up the difference elsewhere — that’s the reassessment.”

Mr. Devine was careful to stress that the senator has already decided that he will compete in every contest, including in California and the District of Columbia, which vote in June.

“Reassess does not mean that he’s not going to be part of this race,” Mr. Devine said. “Reassess does not mean that his message, that we think is the most powerful message, is going to change.”

Michael Briggs, a spokesman for Mr. Sanders’s campaign, also stressed that Mr. Sanders is staying in the race.

“The senator has been clear that this grass-roots campaign is moving forward,” Mr. Briggs said in an email. “He thinks voters in California, the biggest state in the country, and the other states and territories where Democrats still haven’t voted deserve a choice and voice in the democratic process. He’s going to give them that choice. He’s going to take the campaign all the way to the Democratic National Convention in Philadelphia.”

Meanwhile, Mr. Sanders, in what has become somewhat of an Election Day tradition, spent Tuesday posing for pictures, shaking hands, and walking the streets as he courted voters in Philadelphia. The senator visited Reading Terminal Market before walking by City Hall and stopping into a coffee shop. Along the way several people shouted, “Go get ‘em Bernie,” “Free college for my kid,” and, “You’ve got my vote.”

Mr. Sanders also took some questions from reporters, saying it is “absurd” to ask him when he is dropping out of the race.

“The answer is, we are in this race until the last vote is cast,” Mr. Sanders said. “The people of California have a right to determine who they want to see as president of the United States and what kind of agenda they want the Democratic Party to have.”

When asked how he could in good faith continue to raise money while promising that he has a pathway to the nomination, Mr. Sanders frowned.

“As opposed to candidates who raise millions of dollars from Wall Street and the drug companies and the fossil fuel industries?” Mr. Sanders said. “As opposed to me who raises $27 apiece running a campaign that has now won 16 states and that has closed the gap? Yeah, I think we are doing just fine.”

Yet, signs of Mrs. Clinton’s strength in Pennsylvania were clear Tuesday morning. As Mr. Sanders crossed a street, a car full of Clinton supporters waved signs out of the windows shouting, “Hillary, Hillary.” Another man briskly walked past Mr. Sanders saying, “I’m voting for Hillary.”

Pulling Away From Bernie Sanders, Hillary Clinton Is Turning to the Fall Stepping up fund-raising for the general election is among the priorities even if the Democratic nomination contest has yet to be settled.