As Democrats see ominous signs ahead for voting rights, Biden addresses the issue in Philadelphia.

President Biden delivered a speech on voting rights in Philadelphia on Tuesday, as Republicans in state legislatures across the country are seeking to pass measures restricting voting access and as a Democratic effort to overhaul the system has faltered in Congress.

The trip to the birthplace of American democracy was meant to provide a powerful backdrop for Mr. Biden as he tries to revive an embattled centerpiece of his domestic agenda and address a rising feeling among Democrats and civil rights activists that the White House has not done enough to put the issue front and center.

In his speech, Mr. Biden outlined all of the ways his administration is working to further voting access. He is expected to highlight the vice president’s efforts to support voter registration and education. He reinforced the idea that the current crop of Republican statehouse efforts meant to restrict voting access were inspired by a lie that voter fraud upset the 2020 election.

“He will redouble his commitment to using every tool at his disposal to continue to fight to protect the fundamental right of Americans to vote,” Jen Psaki, the White House press secretary, told reporters on Monday. Ms. Psaki also said that Mr. Biden was prepared to “decry efforts to strip the right to vote as authoritarian,” a distinction he has usually reserved for hostile foreign governments.

But absent from the outline detailed by Ms. Psaki is any plan to address growing demand from activists that he call for Democrats to unite behind a change in filibuster rules. Rolling back the filibuster would allow two pieces of ambitious voting rights legislation to pass the Senate with a simple majority vote.

In an interview on Monday, the Rev. Al Sharpton said that he and several other civil rights leaders pushed Mr. Biden to add such an entreaty to Democrats in his speech.

“We encouraged him to make a real appeal to all of the Democrats to get in line,” Mr. Sharpton said, recalling a meeting he and several other civil rights leaders had at the White House with Mr. Biden late last week. “I think he heard us, but I don’t know.”

Mr. Biden’s speech in Philadelphia came as Democrats see a worrying increase in efforts to restrict voting, along with court rulings that would make it harder to fight back against those efforts. A Supreme Court ruling this month weakened the one enforcement clause of the Voting Rights Act that remained after the court invalidated its major provision in 2013. Mr. Biden said a year ago that strengthening the act would be one of his first priorities upon taking office.

While they wait for federal action that may not come, Democrats in states that are passing restrictive laws are resorting to dramatic action to draw national attention to what they feel is an assault on American democracy.

On Monday, a bevy of Texas Democrats flew on chartered planes to Washington to prevent Republicans in their state from attaining a quorum, a temporary way to delay the Texas Legislature from taking up the restrictive voting measures introduced in the State Senate and State House.

Both measures would ban 24-hour voting and drive-through voting; prohibit election officials from proactively sending out absentee ballot applications to voters who have not requested them; add new voter identification requirements for voting by mail; limit third-party ballot collection; increase the criminal penalties for election workers who run afoul of regulations; limit what assistance can be provided to voters; and greatly expand the authority and autonomy of partisan poll watchers.

The restrictions mirror key provisions of a restrictive law passed in Georgia earlier this year, which went even further to assert Republican control over the State Election Board and empower the G.O.P. to suspend county election officials. In June, the Department of Justice sued Georgia over the law, the first significant move of the Biden administration to challenge voter restrictions at the state level.

Activists said Mr. Biden’s speech would show them just how willing he is to spend political capital on the issue at a time when his other agenda items, including an infrastructure package, are subject to delicate negotiations in Congress.

“I think people are looking for his actions to match his rhetoric on this,” Eli Zupnick, a spokesman for the anti-filibuster group Fix Our Senate, said in an interview. “No amount of turnout operations or D.O.J. actions can make up for failure to pass legislation.”