John P. Hale in the context of "United States Attorney"

The Free Soil Party, also called the Free Democratic Party or the Free Democracy, was a political party in the United States from 1848 to 1854, when it merged into the Republican Party. The party was focused on opposing the expansion of slavery into the western territories of the United States. The 1848 presidential election took place in the aftermath of the Mexican–American War and debates over the extension of slavery into the Mexican Cession. After the Whig Party and the Democratic Party nominated presidential candidates who were unwilling to rule out the extension of slavery into the Mexican Cession, anti-slavery Democrats and Whigs joined with members of the Liberty Party (an abolitionist political party) to form the new Free Soil Party. Running as the Free Soil presidential candidate, former President Martin Van Buren won 10.1 percent of the popular vote, the strongest popular vote performance by a third party up to that point in U.S. history.

Though Van Buren and many other Free Soil supporters rejoined the Democrats or the Whigs after the 1848 election, Free Soilers retained a presence in Congress over the next six years. Led by 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 The 1854 Kansas–Nebraska Act repealed the long-standing Missouri Compromise and outraged many Northerners, contributing to the collapse of the Whigs and spurring the creation of a new, broad-based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 Republican Party. Most Free Soilers joined the Republican Party, which emerged as the dominant political party in the United States in the Third Party System (1856–1894).

Presidential elections were held in the United States on November 2, 1852. Democratic nominee Franklin Pierce defeated Whig nominee General Winfield Scott.

Incumbent Whig President Millard Fillmore had succeeded to the presidency in 1850 upon the death of President Zachary Taylor. Fillmore endorsed the Compromise of 1850 and enforced the Fugitive Slave Law. This earned Fillmore Southern voter support and Northern voter opposition. On the 53rd ballot of the sectionally divided 1852 Whig National Convention, Scott defeated Fillmore for the nomination. Democrats divided among four major candidates at the 1852 Democratic National Convention. On the 49th ballot, dark horse candidate Franklin Pierce won nomination by consensus compromise. The Free Soil Party, a third party opposed to the extension of slavery in the United States and into the territories, nominated New Hampshire Senator John P. Hale.