Who were the southern politicians against slavery?

Southern politicians against slavery were relatively few and often faced significant opposition within their own regions. Notable figures included John Quincy Adams, who, though a Northern politician, advocated against the expansion of slavery in the South, and George William Curtis, a Southern-born abolitionist. Additionally, some members of the Democratic Party, like Thomas Hart Benton, expressed anti-slavery sentiments, though they were often marginalized. Overall, the anti-slavery sentiment in the South was limited, as most political power was held by pro-slavery advocates.