In 1972, Gallinghouse obtained an indictment for bribery against C. H. "Sammy" Downs, a former state senator from Alexandria and director of the Louisiana Department of Public Works under Governor John McKeithen, for Downs' role in the Shoup Voting Machine Corporation scandal [REF].
In 1977, in an investigation of vote fraud, Gallinghouse forced the freshman Democratic U.S. Representative Richard Alvin Tonry of Louisiana's 1st congressional district to resign.