Clemens joined the
Democratic Party and was appointed the
United States Attorney for northern and middle Alabama by
President Martin Van Buren in 1839. The same year, he was elected to the
Alabama House of Representatives, serving from 1839 to 1841. He served in the
Texian Army following the
Texas Revolution, and was subsequently elected to the
United States House of Representatives, serving from 1843 to 1845. Following the
U.S. annexation of Texas, Clemens volunteered again for the army and served in the
Mexican–American War; he left the army in 1848 with the rank of colonel. Clemens was elected to the United States Senate in 1849 to fill the vacancy left by the death of
Dixon Hall Lewis. Although a Democrat, Clemens owed his election to the support of Alabama's
Whigs. He opposed the
Compromise of 1850, but abruptly changed course following its passage and helped to organize the short-lived
Union Party in Alabama. The Unionists swept the 1851 elections in Alabama, carrying two-thirds of the state's counties; however, Clemens was not re-elected to the Senate when his term ended in 1853. Dogged by accusations that he had purchased Whig support for his senatorial candidacy in 1848 with promises to back President
Zachary Taylor's legislative agenda, and having earned the enmity of Alabama's Democrats by supporting the Union Party movement, he retired to his plantation with his public reputation severely damaged. Following his departure from the Senate, Clemens joined the
Know Nothing movement and was an unsuccessful candidate for the House of Representatives that year on the American Party ticket. He supported former President
Millard Fillmore in the
1856 United States presidential election, campaigning on his behalf across northern Alabama, but the state voted for Democrat
James Buchanan. Following this last defeat, Clemens retired from public life. He began a literary career, publishing three novels between 1856 and 1860:
Bernard Lile (1856),
Mustang Gray (1858), and
The Rivals (1859). The
secession crisis following the
election of
Abraham Lincoln prompted Clemens's reentry to politics in the winter of 1860–61. Clemens denounced secession in the pages of the
Montgommery Advertiser and as a delegate to the 1861 secession convention. When the delegates voted in favor of secession, however, Clemens reluctantly signed the ordinance announcing Alabama's departure from the Union. He accepted a commission in the
Alabama militia, but his ambivalence towards the
Confederate cause led him to resign within the year. In 1862, he crossed into
Union lines and became Alabama's foremost
Southern Unionist. His fourth novel,
Tobias Wilson, describes Unionist guerrilla warfare in northern Alabama. The war had a radicalizing effect on Clemens's politics, and he became an outspoken defender of the
Lincoln Administration. Clemens strongly supported Lincoln's re-election in the
1864 presidential campaign and traveled to
Washington, D.C. to write campaign literature in support of Lincoln's
National Union Party. Following
Lincolns' assassination, Clemens urged his successor, fellow Southern Unionist
Andrew Johnson, urging him to complete the
abolition of slavery in the United States, but died on May 21, 1865 before he could take an active role in
Reconstruction. ==Novels==