With the 2016 national elections upcoming, wealthy donors supporting both parties are gearing up to throw hundreds of millions of dollars into the races; billionaires David and Charles Koch have already pledged to spend $889 million. But a report from Reuters shows that Americans, frustrated by the overwhelming influence of big money in politics, are organizing to fight back.

In the Philadelphia mayoral race, three billionaires spent $7 million to elect Anthony Hardy Williams. In response, unions and community groups rallied around his challenger, Jim Kenney, organizing a march to stop the wealthy donors from “buying [their] next mayor.” Technological developments are making such organization easier: the creators of Crowdpac, an app that lets entrepreneurs gather funding towards donations, say that they want the app to be used to organize small donors to counteract the effects of billionaire spending.

This is reflective of a wider trend in public opinion. Americans are sick of letting big money influence their elections; 84 percent say that money has too much influence in political campaigns today and nearly 3 in 4 Americans support a constitutional amendment to overturn the Citizens United decision and limit campaign spending.

“There’s growing public awareness about rich people trying to buy elections and that makes the task of winning all the more difficult,” said Darrel West of the Brookings Institute.

Americans have organized at all levels of government to get big money out of politics. Activists have held rallies and marches devoted to the cause and demanded that their representatives in Congress take steps to reduce big money’s influence. Five million of them have signed a petition calling for a constitutional amendment to limit the amount of money spent in politics. Sixteen states and more than 650 cities have already called for an amendment.

President Obama is on board, and presidential candidates like Hillary Clinton, Lindsey Graham, and Bernie Sanders have expressed support for a constitutional amendment. Clinton and Sanders have also emphasized the importance of nominating Supreme Court Justices who would restore balance to the Supreme Court and restore the American people’s ability to impose reasonable limits on money in politics.

The movement against big money in politics is gaining momentum as the election nears.