Davis volunteered for John V. Tunney's campaign for the United States Senate in 1970. He started a statewide neighborhood crime watch program while serving as chairman of the California Council on Criminal Justice. His initial political experience included working to help Tom Bradley win election as Los Angeles's first black mayor in 1973. The historical significance of Bradley's victory further inspired Davis to pursue a career in politics. Davis ran for state treasurer in 1974 but lost when the more popular Jesse Unruh filed to run on the deadline.