Swift left his commercial enterprises in 1861 for the state senate seat that propelled him into the governorship. Later he served two more terms in the senate and was a reluctant candidate for the U.S. Senate. "I shall be ten times happier with my family in St. Peter than as Senator at Washington," he declared characteristically upon learning he had lost the Republican senatorial nomination in 1865. Four years later, he succumbed to typhoid fever at age 45.
