SPRECKELS, Calif. — Bernie Sanders signaled Wednesday that he would continue his presidential campaign beyond the California primary next week, saying he had the money to keep running until the Democratic National Convention next month.

During a news conference while campaigning in California, the Vermont senator said he already had plans to host events in Washington next week and to lobby superdelegates to withdraw their support from Hillary Clinton and back him instead. He added that he felt confident he can win California’s primary on Tuesday and that Mrs. Clinton was campaigning in the state because of polls showing the two locked in a tight race there. An NBC News/Wall Street Journal/Marist poll released on Wednesday shows the race in a statistical tie.

“We have absolutely the financial resources that we need to run a very, very strong campaign here in California and in the other states and in D.C. and Puerto Rico and Virgin Islands and throughout the rest of the campaign,” Mr. Sanders said.

He chided Mrs. Clinton for deciding to campaign in California, where she is counting on minority voters to propel her to victory.