William H. Seward
The Republican Party had been founded in 1854, in reaction to the Kansas-Nebraska Act. Its anti-slavery stance was attractive to Seward, but he needed the Whig structure in New York to get re-elected. In September 1855, the New York Whig and Republican parties held simultaneous conventions that quickly merged into one. Seward was the most prominent figure to join the new party, and was spoken of as a possible presidential candidate in 1856. Weed, however, did not feel that the new party was strong enough on a national level to secure the presidency, and advised Seward to wait until 1860. When Seward's name was mentioned at the 1856 Republican National Convention, a huge ovation broke out. In the 1856 presidential election, the Democratic candidate, former Pennsylvania senator James Buchanan, defeated the Republican, former California senator John C. Frémont, and the Know Nothing candidate, former president Fillmore.
1856 Republican National Convention
On June 19, 1855, a small gathering of like-minded individuals met in Washington, D.C. where they passed a resolution noting the recent abrogation of "all compromises, real or imaginary" by the opening of Kansas Territory and Nebraska Territory to the possible institution of slavery. These proclaimed themselves the "Republican Association of Washington, District of Columbia" and passed a simple four plank platform including the demand that "There should be neither slavery nor involuntary servitude, except for the punishment of crime, in any of the Territories of the United States." A number of state organizations were soon established along similar lines and the Republican Party was effectively born.