Answer:
Abraham Lincoln, John Breckenridge, John Bell, And Stephen Douglas
Explanation:
Abraham Lincoln → National Union Party → Lincoln was morally opposed to slavery
John Breckenridge → Democratic Party → Had publicly declared his opposition to "impairing in any form" the legal protection of slavery.
John Bell → Democratic Party → Bell opposed efforts to expand slavery to the U.S. territories.
Stephen Douglas → Democratic Party → Douglas believed that popular sovereignty would defuse the tension between the proslavery and antislavery factions.
I hope this helps!
