Nast and "Harper's" also played an important part in securing Rutherford B. Hayes' 1876 presidential election. Later on Hayes remarked that Nast was "the most powerful, single-handed aid had". After the election, Nast's role in the magazine diminished considerably. Since the late 1860s, Nast and George W. Curtis had frequently differed on political matters and particularly on the role of cartoons in political discourse. Curtis believed that mockery by caricature should be reserved for Democrats, and did not approve of Nast's cartoons assailing Republicans such as Carl Schurz and Charles Sumner, who opposed policies of the Grant administration. "Harper's" publisher Fletcher Harper strongly supported Nast in his disputes with Curtis. In 1877, Harper died, and his nephews, Joseph W. Harper Jr. and John Henry Harper, assumed control of the magazine. They were more sympathetic to Curtis' arguments for rejecting cartoons that contradicted his editorial positions.