== Marriage and early career == After his college graduation in 1852, Harrison studied law with Judge Bellamy Storer of Cincinnati, but before he completed his studies, he returned to Oxford, Ohio, to marry Caroline Scott on October 20, 1853. Harrison became a founding member and first president of both the University Club, a private gentlemen's club in Indianapolis, and the Phi Delta Theta Alumni Club. Harrison and his wife became members and assumed leadership positions at Indianapolis's First Presbyterian Church.Having grown up in a Whig household, Harrison initially favored that party's politics, but joined the Republican Party shortly after its formation in 1856 and campaigned on behalf of Republican presidential candidate John C. Frémont. In 1857 Harrison was elected Indianapolis city attorney, a position that paid an annual salary of $400 (equivalent to $10,976 in 2019).In 1858, Harrison entered into a law partnership with William Wallace to form the law office of Wallace and Harrison. After her death in 1948, Mary Dimmick Harrison, his second wife, was buried beside him.