Four major candidates vied for the presidential nomination – Lewis Cass of Michigan, the nominee in 1848, who had the backing of northerners in support of the Compromise of 1850; James Buchanan of Pennsylvania, popular in the South as well as in his home state; Stephen A. Douglas of Illinois, candidate of the expansionists and the railroad interests; and William L. Marcy of New York, whose strength was centered in his home state.

The convention took place at the Maryland Institute for the Promotion of the Mechanic Arts and was called to order by Democratic National Committee chairman Benjamin F.

[3] As Democrats convened in Baltimore in June 1852, four major candidates vied for the nomination – Lewis Cass of Michigan, the nominee in 1848, who had the backing of northerners in support of the Compromise of 1850; James Buchanan of Pennsylvania, popular in the South as well as in his home state; Stephen A. Douglas of Illinois, candidate of the expansionists and the railroad interests; and William L. Marcy of New York, whose strength was centered in his home state.

With a two-thirds majority required to win, Cass led on the first 19 ballots, with Buchanan second and Douglas and Marcy exchanging third and fourth places.

[4] After being nominated by the Virginia delegation, Pierce's support remained steady until the 46th ballot, when it began to increase at Cass's expense.

During the ensuing campaign, King's tuberculosis, which he believed he had contracted while living in Paris, denied him the active behind-the-scenes role that he might otherwise have played, although he worked hard to assure his region's voters with the statement that New Hampshire's Pierce was a "northern man with southern principles."