sentences:  Omaha Democrats nominated James C. "Cowboy Jim" Dahlman, a popular, first-time candidate.Dahlman seemed to be more tolerant of Dennison's "Sporting District", so Dennison supported him.Dahlman was elected mayor that year, and in eight out of nine subsequent campaigns for mayor between 1906 and 1930; Dahlman's losing the election in 1918 was part of the background to racial violence in Omaha.