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.