has he done a campaign for any other leader?
Yes, for  Lincoln
William H. Seward
New York was key to the election; a Lincoln loss there would deadlock the Electoral College. Soon after his return from his Midwest tour, Seward embarked on another, speaking to large crowds across the state of New York. At Weed's urging he went to New York City and gave a patriotic speech before a large crowd on November 3, only three days before the election. On Election Day, Lincoln carried most Northern states, while Breckinridge took the Deep South, Bell three border states, and Douglas won Missouri—the only state Seward campaigned in that Lincoln did not win. Lincoln was elected.
who was william h. seward? He was United States Secretary of State, and earlier served as governor of New York and as a United States Senator. where was he born? Village of Florida which political party did he represent? Republican Party when did he become the governor? January 1, 1839
wiki:13428181
William H. Seward [SEP] Campaigning for Lincoln
New York was key to the election; a Lincoln loss there would deadlock the Electoral College. Soon after his return from his Midwest tour, Seward embarked on another, speaking to large crowds across the state of New York. At Weed's urging he went to New York City and gave a patriotic speech before a large crowd on November 3, only three days before the election. On Election Day, Lincoln carried most Northern states, while Breckinridge took the Deep South, Bell three border states, and Douglas won Missouri—the only state Seward campaigned in that Lincoln did not win. Lincoln was elected.