In the [[United States presidential election, 1872|1872 presidential election]], Trumbull opposed re-electing President Grant and joined the Liberal Republican Party<ref name=britannicabio/> spearheaded by [[Charles Sumner]] and [[Horace Greeley]]. Greeley failed to defeat Grant when heading the party ticket for the general election, and Trumbull retired at the end of his third Senate term. | In the [[United States presidential election, 1872|1872 presidential election]], Trumbull opposed re-electing President Grant and joined the Liberal Republican Party<ref name=britannicabio/> spearheaded by [[Charles Sumner]] and [[Horace Greeley]]. Greeley failed to defeat Grant when heading the party ticket for the general election, and Trumbull retired at the end of his third Senate term. |