The Eighth Circuit will hear Libertarian Party of Arkansas v Martin, 16-3794, on Wednesday, September 20. On September 12, the panel of judges assigned to the case sent a letter to both sides, asking them to be prepared to discuss whether the case is moot or not. That is because, after the Libertarian Party won the case in U.S. District Court, the legislature amended the law to substantially fix the problem that the Libertarians had complained about.
The issue in the original case was whether it is constitutional to force newly-qualifying parties to choose all their non-presidential nominees (in a convention) months before the major parties hold their primaries. After the state lost the case in U.S. District Court, the legislature liberalized the convention deadline, by moving it to primary day.
Even though the legislature removed the problem that had caused the lawsuit, the state continues to appeal the decision. No other state in the history of constitutional ballot access litigation had ever continued to appeal a lower court decision, after the legislature amended the law in the direction desired by the plaintiffs. Thus there is no precedent on ballot access mootness for this type of situation.