In 1966, Davis was elected as a Republican to the Michigan House of Representatives from the state's 106th District and was reelected in 1968. In 1970, Davis was elected to the Michigan State Senate from the 37th district and was reelected in 1974. He served as the Majority Whip, 1970–1974, and as Senate Republican Leader, 1974–1978. In 1978, Davis was elected to the 96th United States Congress and was subsequently re-elected to the six succeeding Congresses. Davis did not seek re-election in 1992. In Congress, Davis helped establish the Thunder Bay National Marine Sanctuary and the Keweenaw National Historical Park. In early 1992, Davis was implicated in the House banking scandal or congressional check-kiting scandal. The Congress ran its own bank and allowed members who wished to do so to frequently write overdrawn or insufficient fund checks to their account. Davis was one of the most notorious of these, writing many overdrawn checks. There was no illegality, though, since the bank allowed members overdraft protection. For the elections of 1992, after redistricting due to the 1990 Census, most of what had been 11th congressional district became Michigan's 1st congressional district, while the 11th district was apportioned to represent a part of the Metro Detroit area. In 1992, DemocratBart Stupak was elected from 1st district, succeeding Davis as U.S. Representative for the U.P. and Northern Michigan. Stupak, coincidentally, defeated Philip Ruppe, the man Davis replaced as congressman in 1978. Davis lived in Gaylord, Michigan.
Post-Congressional career and life
He became a lobbyist for K&L Gates. He was active in the Bush campaign, having served on the Michigan Bush Committee, and was a friend and former colleague of Vice President Dick Cheney. According to the Chicago Sun-Times of May 31, 1989, Davis revealed that he hired a woman with whom he lived for his committee staff, but he said he had not violated House rules. Davis was separated from his third wife, Marty Davis, and had filed for divorce. He acknowledged recommending that Brook Ball, 27, be hired for the House Merchant Marine staff. He married Ball, who survives him, as do his five children. Davis died at a hospice in Arlington, Virginia at age 77 of heart and kidney failure. Robert is interred at Protestant Cemetery Mackinac Island Michigan, USA
