Hannibal Hamlin was bornin Oxford County, Maine, on 27th August, 1809. He worked on the family farm before being employed as a compositor in a printing office. He also worked as a surveyor and school teacher before studying law and being admitted to the bar in 1833.
A member of the Democratic Party, Hamlin was elected to Maine's House of Representatives in 1836 and served as speaker in 1837, 1839 and 1840. Hamlin was elected to the 28th Congress in 1842 and the 29th Congress in 1844 where he served as chairman of the Committee on Elections.
Unhappy with his party's views on slavery, and after the passage of the Kansas-Nebraska Act, Hamlin joined the Republican Party. After a short period as governor of Maine, Hamlin returned to the Senate in March, 1857. In 1860 the Republican Party nominated Abraham Lincoln as its presidential candidate. Hamlin was selected as his running mate.
Lincoln won the presidential election with with 1,866,462 votes (18 free states) and beat Stephen A. Douglas (1,375,157 - 1 slave state), John Beckenridge (847,953 - 13 slave states) and John Bell (589,581 - 3 slave states). Between election day in November, 1860 and inauguration the following March, seven states seceded from the Union: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana and Texas.
During the American Civil War Hamlin loyally supported Abraham Lincoln. However, in 1864 leading members of the Republican Party began to suggest that Lincoln should replace Hamlin as his running mate in the presidential election. Hamlin was a Radical Republican and it was felt that Lincoln was already sure to gain the support of this political group. It was argued that what Lincoln needed was the votes of those who had previously supported the Democratic Party in the North.
It was decided that Andrew Johnson, the governor of Tennessee, would make the best candidate for vice president. By choosing the governor of Tennessee, Lincoln would emphasis that Southern states status were still part of the Union. He would also gain the support of the large War Democrat faction. At a convention of the Republican Party on 8th July, 1864, Johnson received 200 votes to Hamlin's 150 and became Lincoln's running mate. This upset Radical Republications as Johnson had previously made it clear that he was a supporter of slavery.
Hamlin returned to the Senate in 1869 and served as chairman of the Committee on the District of Columbia (41st Congress), Committee of Manufactures (42nd Congress), Committee on Mines and Mining (42nd and 43rd Congresses), Committee of Post Offices and Post Roads (44th and 45th Congresses) and Committee on Foreign Relations (45th Congress). Hannibal Hamlin died in Bangor, Maine, on 4th July, 1891.