The U.S. Supreme Court is currently considering whether to hear Elster v City of Seattle, 19-608. The Court had this case on its March 20 conference, but on March 18, the Court said it would instead consider it at some later conference; the date for that future conference has not yet been decided.
The issue is the Seattle city policy of issuing campaign finance vouchers to every registered voter. The voter can use them to help his or her favorite candidate for city office. The voter gives the candidate a voucher, and then that candidate can turn it in for money for the campaign. The city pays for this program with a tax. The opponents of the system say it violates the First Amendment by forcing taxpayers to subsidize speech they disagree with. The Washington State Supreme Court had upheld the program.