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.
Republican Party (United States)
The party's founding members chose the name Republican Party in the mid-1850s as homage to the values of republicanism promoted by Thomas Jefferson's Republican Party. The idea for the name came from an editorial by the party's leading publicist, Horace Greeley, who called for "some simple name like 'Republican' [that] would more fitly designate those who had united to restore the Union to its true mission of champion and promulgator of Liberty rather than propagandist of slavery". The name reflects the 1776 republican values of civic virtue and opposition to aristocracy and corruption. It is important to note that "republican" has a variety of meanings around the world and the Republican Party has evolved such that the meanings no longer always align.