In 1962, Conable was elected as a Republican to the New York State Senate. After only one term, he was elected to the U.S. House of Representatives in 1964 from a Rochester-based district. He was reelected nine more times. He was known on both sides of the aisle for his honesty and integrity, at one point being voted by his colleagues the "most respected" member of Congress; he refused to accept personal contributions larger than $50. As a longtime ranking minority member of the House Ways and Means Committee,[2]: 205 one of his signal legislative achievements was a provision in the U.S. tax code that made so-called 401(k) and 403(b) defined-contribution retirement plans possible, and contributions to those plans by both employers and employees tax-deferred, under federal tax law.
A long-time ally of Richard Nixon, Conable broke with him in disgust after the revelations of the Watergate scandal. When the White House released a tape of Nixon instructing his chief of staff H. R. Haldeman to obstruct the FBI investigation, Conable said it was a "smoking gun", a phrase which quickly entered the political folklore.
From 1986 until August 31, 1991, Conable was president of the World Bank.[2]: 204 His experience as a legislator proved crucial as he persuaded his former colleagues to almost double Congress's appropriations for the bank.
After the Tiananmen Square protests and massacre, Conable opposed elements of the George H.W. Bush administration and Congress which sought to take a more punitive stance toward China.[2]: 205 In Conable's view, those elements were motivated by the desire to improve their position in the 1992 election by being overly harsh on China.[2]: 205 Conable's view was that imposing excessive punishment was ill-advised at a time when Deng Xiaoping was struggling with domestic opponents over whether to continue economic reform.[2]: 205 Conable successfully encouraged the World Bank Board of Governors to take an expansive view of humanitarian loans to China, including with regard to environmental loans because of the intrinsic merit of those investments.[2]: 205 When asked by academic David M. Lampton what Conable was most proud of in his World Bank interaction with China, Conable answered, "We planted a billion trees in China."[2]: 205
Literature by and about Conable
Window on Congress: A Congressional Biography of Barber B. Conable Jr., James S. Fleming, Rochester, New York: University of Rochester Press, 2004, ISBN1-58046-128-X.
The Conable Years at the World Bank: Major Policy Addresses of Barber B. Conable, 1986–91, Barber B. Conable Jr., Washington, D.C.: World Bank, 1991, ISBN0-8213-1901-9.
Congress and The Income Tax, Barber B. Conable Jr. and Arthur L. Singleton, Norman, Oklahoma: University of Oklahoma Press, 1989, ISBN0-8061-2195-5.
Controlling the Cost of Social Security: Held on June 25, 1981, and Sponsored by the American Enterprise Institute for Public Policy Research, Barber B. Conable Jr., John Charles, et al., Washington, D.C.: The Institute, 1981, ISBN0-8447-2225-1.
Foreign Assistance in a Time of Constraints, Barber B. Conable Jr., Richard S. Belous, S. Dahlia Stern, and Nita Christine Kent, eds., Washington, D.C.: National Planning Association, 1995, ISBN0-89068-132-5.