Constitutional Amendment 2, a reform measure approved in November, is facing a second legal challenge in federal court from plaintiffs who claim the amendment unconstitutionally restricts free speech and association.

The suit was filed by Farmers State Bank and Herzog Services, with additional plaintiffs including the American Democracy Alliance, Missourians for Worker Freedom, Freedom PAC, the Free and Fair Election Fund, and John Elliott, a citizen. Plaintiffs contend the amendment’s contribution restrictions impermissibly prohibit corporate (including nonprofit) contributions in ballot measure and judicial retention campaigns.

A separate suit was filed by the Association of Missouri Electrical Cooperatives earlier in December.