In West Virginia, when a state legislator resigns, that legislator’s party may choose three possible replacements, and the Governor then chooses one of those three names. On January 22, the West Virginia Supreme Court ruled 3-1 that the Republican Party, not the Democratic Party, may submit three names to the Governor. State ex rel Biafore v Tomblin, 16-0013. This link goes to the court’s web page. There are separate links to the opinion of the court, and two concurring opinions. The dissenting justice hasn’t written a dissent yet.
The Senate vacancy was created on December 29, 2015, when State Senator Daniel Jackson Hall resigned. Hall was elected as a Democrat in November 2012 to a four-year term. In November 2015 he switched parties, from Democratic to Republican. Then he resigned. Democrats filed the lawsuit, arguing that they should be the party that gets to submit three replacement possibilities, but the Court ruled in favor of the Republicans. The law says the party that gets to choose is “the party with which the person holding the office immediately preceding the vacancy was affiliated.”