The 1860 Republican National Convention was a presidential nominating convention that met May 16–18 in Chicago, Illinois. It was held to nominate the Republican Party's candidates for president and vice president in the 1860 election. The convention selected former representative Abraham Lincoln of Illinois for president and Senator Hannibal Hamlin of Maine for vice president. Entering the 1860 convention, Senator William H. Seward of New York was generally regarded as the front-runner, but Lincoln, Governor Salmon P. Chase of Ohio, former representative Edward Bates of Missouri, and Senator Simon Cameron of Pennsylvania all commanded support from a significant share of delegates. Seward led on the first ballot but fell short of a majority, while Lincoln finished in a strong second place. Cameron's delegates shifted to Lincoln on the second ballot, leaving Lincoln essentially tied with Seward. Lincoln clinched the nomination on the third ballot after consolidating support from more delegates who had backed candidates other than Seward. Hamlin was nominated on the second vice presidential ballot, defeating Cassius Clay of Kentucky and several other candidates. The ticket of Lincoln and Hamlin went on to win the 1860 general election. After taking office in 1861, Lincoln appointed all four of his major opponents to his cabinet: Seward for secretary of state, Chase for secretary of the treasury (and later for chief justice), Bates for attorney general, and Cameron for secretary of war. History Background By 1860 the dissolution of the Whig Party in America had become an accomplished fact, with establishment Whig politicians, former Free Soilers, and a certain number of anti-Catholic populists from the Know Nothing movement flocking to the banner of the fledgling anti-slavery Republican Party. While 1856 Republican presidential nominee John C. Frémont had met with failure, party gains were made throughout the Northern United States as the sectional crisis over slavery intensified. Party leaders sought to hold their 1860 nominating convention in the burgeoning Middle Western trade center of Chicago, then a city of some 110,000 people. The city had no sufficiently large meeting hall, so an appropriation was made for a temporary wood-frame assembly hallknown as the "Wigwam"to seat ten thousand delegates, guests, and observers.<ref>George O. Seilhamer, Leslie's History of the Republican Party: Vol. 1: Narrative and Critical History, 1856–1898." New York: L.A. Williams Publishing and Engraving Co., 1898; p. 55.</ref> The rapidly designed and constructed building proved well fit for the purpose, featuring excellent lines