Maine Republican Party v. Dunlap (Jon D. Levy, 1:18-cv-179) and Baber v. Dunlap (Lance E. Walker, 1:18-cv-465) (D. Me.)
For federal elections in 2018, Maine used ranked-choice voting, a voting method that provides instant-runoff votes if no candidate gets a majority of first-choice votes. In May, a political party sought a federal injunction against the use of ranked-choice voting in its primary election. A federal district judge denied the party relief. In November, neither major-party candidate earned a majority of first-place votes in a congressional election. The plurality winner’s efforts at a federal injunction against counting second and third choices of voters who ranked independent candidates first were unsuccessful.
Subject: Voting procedures. Topics: Instant runoff; enjoining certification; party procedures; primary election; intervention.

One of many Case Studies in Emergency Election Litigation.