On March 6, 1857, President James Buchanan appointed Cass to serve as Secretary of State as a consolation prize for his previous presidential runs. Although retaining incumbent Secretary of State William L. Marcy was considered the best option by many, Buchanan made it clear that he did not want to keep anyone from the Pierce Administration. Moreover, Marcy had opposed his earlier presidential bids, and was in poor health in any event, ultimately dying in July 1857. Cass, aged 75, was seen by most as too old for such a demanding position and was thought to be likely be little more than a figurehead. Buchanan, weighing many of the other options for Secretary of State, considered that Cass was the best choice to avoid political infighting and sectional tensions. Buchanan, who did not particularly like Cass, nonetheless wrote a flattering letter offering him the post of Secretary of State, commenting that he was remarkably active and energetic for his advanced age. Cass, who was retiring from the Senate, but not eager to leave Washington and return home to Michigan, immediately accepted.