In Seattle, every voter is entitled to receive four campaign finance vouchers, and to give a voucher to his or her favorite candidates. The recipient candidate can then collect $25 from the city, to use for a campaign for city elective office. The money comes from a property tax levy.
Opponents of that program challenged it in state court, but lost. Now they have asked the U.S. Supreme Court to hear their appeal.
Here is the cert petition in Elster v City of Seattle, 19-608.