“ In July when it became apparent that Tunica County intended to move ahead with the election despite the Department of Justice's July 12 letter informing them of an ongoing investigation, appellants filed for a temporary restraining order in District Court. After the September 3 denial of preclearance, appellants immediately sought a preliminary injunction. After the September 13 decision of the three-judge District Court, appellants filed a motion for injunctive relief in this Court within 30 days. Appellants have displayed no lack of diligence in challenging this election. ”