Though Van Buren and many other Free Soil supporters rejoined the Democrats or the Whigs immediately after the 1848 election, Free Soilers retained a presence in Congress over the next six years. Led by individuals like Salmon P. Chase of Ohio, John P. Hale of New Hampshire, and Charles Sumner of Massachusetts, the Free Soilers strongly opposed the Compromise of 1850, which temporarily settled the issue of slavery in the Mexican Cession. Hale ran as the party's presidential candidate in the 1852 presidential election, taking just under five percent of the vote. The 1854 Kansas–Nebraska Act repealed the long-standing Missouri Compromise and outraged many Northerners, contributing to the collapse of the Whigs and spurring the creation of a new, broad-based anti-slavery party known as the Republican Party. Most Free Soilers joined the Republican Party, which emerged as the dominant political party in the United States in the subsequent Third Party System (1856–1894).