The U.S. Supreme Court case Michele L. Timmons, Acting Director, Ramsey County Department of Property Records and Revenue, et al. v. Twin Cities Area New Party in 1996 revolved around the issue of "fusion" candidacies where a candidate can appear on the ballot as the nominee of more than one party - a practice allowed by some states but prohibited by others including Minnesota from which this case originated. The Twin Cities Area New Party challenged this prohibition arguing that it violated their First Amendment rights to freedom of association and Fourteenth Amendment right to equal protection under law since they were unable to nominate an individual who was already another party's candidate for office. However, the Supreme Court ruled against them upholding Minnesota’s ban on fusion candidates with a 6-3 decision stating that while political parties have constitutional rights to select their own standard bearers without state interference; these do not extend so far as requiring states allow multiple parties endorse same candidate thus validating laws prohibiting fusion candidacies if they serve legitimate state interests such as reducing voter confusion and promoting political stability.

In the dissenting opinion for Timmons v. Twin Cities Area New Party, Justice Stevens argued that Minnesota's anti-fusion law, which prevents a candidate from appearing on the ballot as the nominee of more than one party, violated First Amendment rights to freedom of association. He contended that this law restricted political parties' ability to select their preferred candidates and voters' right to cast meaningful votes. The majority ruling upheld this law based on its potential benefits such as preventing voter confusion and maintaining stable political systems; however, Justice Stevens disagreed with these justifications. He believed there was no substantial evidence supporting claims of possible voter confusion or instability in states without similar laws. Furthermore, he asserted that even if such risks existed they should not override fundamental democratic principles like free choice in voting and candidacy selection by parties.