Which political party ran Martin van Buren for president in 1834 as an antislavery candidate?

The Anti-Masonic Party ran Martin Van Buren as a presidential candidate in 1834, positioning him as an antislavery alternative. Although he was not officially an antislavery candidate in the modern sense, his candidacy was supported by factions that opposed the expansion of slavery. Van Buren ultimately became the first president from the Democratic Party, which had a complex relationship with the issue of slavery during his time.