Sen. Arlen Specter, Charles Robbins (2012). “Life Among the Cannibals: A Political Career, a Tea Party Uprising, and the End of Governing As We Know It”, p.241, Macmillan
Campaign remark, Fresno, Cal., 10 Sept. 1952. John F. Parker, in "If Elected, I Promise ...": Stories and Gems of Wisdom by and About Politicians (1969), attributes the reverse statement to Chauncey Depew (1834 - 1928): "If you will refrain from telling any lies about the Republican party, I'll promise not to tell the truth about the Democrats."