Libertarian Party and Independent party of Connecticut challenged the State petition requirements for Ballot access for minor parties on the grounds that they create an undue burden on the parties and deprives voters of an effective choice of candidates. The ballot access requirements were modified during COVID-19 to reduce the burden so that petitions did not need to be signed in person and so that the number of signatures required was reduced.
https://healthyelections-case-tracker.stanford.edu/detail?id=152