By Douglas Burns Manilla Democrat plans to spotlight farming, education, infrastructure and health care. Dave Muhlbauer is the third generation in his family to consecutively serve in public office. His late grandfather, Louis, and father, Dan, were both state representatives in western Iowa. Photo By Douglas Burns. Former Crawford County Supervisor Dave Muhlbauer, a Manilla farmer and cattleman with deep family roots in rural Iowa politics, this morning announced his bid for U.S. Sen. Charles Grassleyâs seat. Muhlbauer, who describes himself as an âold-school farming-labor Democrat,â is the only well-known Democrat to enter the November 2022 U.S. Senate race to this point. For his part, Grassley, a Republican who has held his U.S. Senate seat since 1981, says he may file for an eighth term, but likely wonât make his plans known until fall.