WASHINGTON — As Democrats fume over Republican-crafted state laws putting new limits on voting, a Senate panel will take up a sweeping bill Tuesday that would try to use the federal government’s power to make voting easier nationwide.

Activists are using multimillion-dollar advertising and grassroots campaigns to push for the bill, applying pressure to some Democrats in the 50-50 Senate. But while the 800-page overhaul of election, campaign finance and ethics laws known as S 1 (HR 1 in the House) is likely to generate lots of heat at the hearing, there is not expected to be much action on changes to the measure in the Senate Rules and Administration Committee.

That’s because a power-sharing agreement reached by leaders of both parties at the start of the Senate term gave the Rules panel nine Democrats and nine Republicans, and the committee cannot adopt amendments on a tie vote.

As a result, any real action to modify the measure would happen on the Senate floor some time in the future.

“I’m expecting that this will end in a 9-9 vote on reporting it out, and then it will go to the floor,” said Fred Wertheimer, president of the advocacy group Democracy 21 that is pushing for the bill’s passage. He added that Senate Majority Leader Charles E. Schumer has committed to bringing the measure to the floor of the chamber.

Schumer and Minority Leader Mitch McConnell both serve on the Rules Committee. And given that both have made the bill a priority — Schumer to pass it and McConnell to stop it — they are likely to participate.

McConnell, a spokesman said, “will certainly be active at the markup.”

The measure would revamp how congressional candidates finance their campaigns, and it would set minimum standards for federal elections and voting, including mandating same-day voter registration. To reduce the influence of big campaign donors and provide a way for less affluent candidates, who don’t have networks of big donors, to run for office, the bill would create an optional system under which $6 in public funds are provided for every $1 a candidate raises from donors giving less than $200. Those funds would come from additional assessments, or surcharges, on fines already paid by tax cheats or companies fined for criminal or civil penalties.

The measure would also establish new ethical standards for lobbyists, lawmakers and Supreme Court justices. And, in a nod to the scandals of the Trump era, it would require presidential and vice presidential candidates to disclose 10 years’ worth of tax returns.

Democrats in both chambers have been largely unified in public support of the measure, with some rare exceptions, including Mississippi Rep. Bennie Thompson, a co-sponsor of the House version, who ultimately voted against it over concerns about the public financing portions as well as those that would establish independent commissions to redraw congressional district lines.