Liberal Republican Party (United States) in the context of "Radical Republican"

Charles Sumner (January 6, 1811 – March 11, 1874) was an American lawyer and statesman who represented Massachusetts in the United States Senate from 1851 until his death in 1874. Before and during the American Civil War, he was a leading American advocate for the abolition of slavery, and after the war he was a key figure in the Reconstruction era, during which he and other Radical Republicans successfully fought to end slavery and ensure basic rights for Black Americans. He continued advocating for racial equality until his death, lobbying in his final days for a civil rights bill that served as a model for the Civil Rights Act of 1964. Historians credit Sumner with coining the phrase "equality before the law," which he first used as part of an early attempt to integrate Boston's public school system.

Sumner chaired the Senate Foreign Relations Committee from 1861 to 1871, until he lost the position following a dispute with President Ulysses S. Grant over the attempted annexation of Santo Domingo. After breaking with Grant, he joined the Liberal Republican Party, spending his final two years in the Senate alienated from his party.

Moderate Republicans were a faction of American politicians within the Republican Party from the party's founding before the American Civil War in 1854 until the end of Reconstruction in the Compromise of 1877. They were known for their loyal support of President Abraham Lincoln's war policies and opposed the more militant stances advocated by the Radical Republicans. According to historian Eric Foner, congressional leaders of the faction were James G. Blaine, John A. Bingham, William P. Fessenden, Lyman Trumbull, and John Sherman. Their constituencies were primarily residents of states outside New England, where Radical Republicanism garnered insufficient support. They included "Conservative Republicans" and the moderate Liberal Republicans, later also known as "Half-Breeds".

During the 1864 United States presidential election, amidst the backdrop of the ongoing Civil War, moderate Republicans supported merging the Republican Party with the War Democrats (Democrats who supported the continuation of the Union war effort) to form the National Union Party alliance. At the Republican National Convention (which operated under the name of the "National Union National Convention" that year), they spearheaded the effort to replace Lincoln's vice president Hannibal Hamlin with Tennessee Democrat Andrew Johnson, acting out of the belief that placing a War Democrat on the presidential ticket would solidify support to ensure Lincoln's re-election.

Texas was admitted to the United States on December 29, 1845, and elects its U.S. senators to class 1 and class 2. The state's current senators are Republicans John Cornyn (serving since 2002) and Ted Cruz (serving since 2013). A total of 27 Democrats, 7 Republicans, and 1 Liberal Republican have served or are serving as U.S. senators from Texas. Morris Sheppard was Texas's longest-serving senator (1913–1941).