My choice early in life was either to be a piano-player in a whorehouse or a politician. And to tell the truth, there’s hardly any difference.

Harry S Truman (1884-1972) US President (1945-1953)

(Attributed)

Widely quoted in respectable biographies of Truman, but unsourced. Sometimes paraphrased: "Being a politician is like being a piano player in a whorehouse."