Joseph's presidential platform includes abolishing slavery.
"General Smith’s Views of the Powers and Policy of the Government of the United States, circa 26 January–7 February 1844," p. 9, The Joseph Smith Papers website, accessed April 26, 2022
Petition also, ye goodly inhabitants of the slave states, your legislators to abolish slavery by the year 1850, or now, and save the abolitionist from reproach and ruin, infamy and shame. Pray Congress to pay every man a reasonable price for his slaves out of the surplus revenue arising from the sale of public lands, and from the deduction of pay from the members of Congress. Break off the shackles from the poor black man, and hire him to labor like other human beings; for “an hour of virtuous liberty on earth, is worth a whole eternity of bondage!”