<P> Several groups were formed in response to Citizens United, including Move to Amend, American Promise, and Wolf - PAC . Move to Amend was founded in 2009, and have become one of the larger organizations working to reform Campaign Finance . In 2016, American lawyer Jeff Clements, founded American Promise, a newer organization seeking to coordinate some of the effort . These non-profit organizations are all calling for a 28th Amendment to the United States Constitution to overturn the decision, as well as Buckley, and the underlying doctrine equating political spending with free speech . So far, 19 states have called for the amendment, either by legislative resolution or ballot initiative . </P> <P> In 2011, a political action committee called Wolf PAC was formed in response to the Citizens United decision . Its goal is to pass an amendment to overturn the decision, along with substantially similar Supreme Court decisions such as Buckley v. Valeo, and to institute a system of public financing for all elections in the United States . Wolf PAC's strategy is to call for an Article V convention to propose this amendment, rather than passing it through Congress, which it views as too corrupt . As of February 2015, four states, California, Vermont, Illinois and New Jersey have passed resolutions calling for such a convention . </P> <P> In September 2014, Senate Democrats attempted to campaign for a constitutional amendment that would allow Congress and the states to limit the money raised and spent in election campaigns by outside groups, candidates and others, with a special aim at corporations and similar entities spending money on elections . Such action would, according to Republicans, violate the First Amendment right to free speech . </P> <P> At the federal level, public funding is limited to subsidies for presidential campaigns . This includes (1) a "matching" program for the first $250 of each individual contribution during the primary campaign, (2) financing the major parties' national nominating conventions, and (3) funding the major party nominees' general election campaigns . </P>

Which of the following is not a source of financing for a campaign