Don't know very much about this period of US history beyond the basics, but were there any political figures during the late 1850s, 1860s, and even 1870s who had a decent shot at winning the Presidency and would have been far more radical on abolishing slavery and dismantling the South's racial caste system than Abraham Lincoln? Assume Lincoln doesn't run for President and a Civil War ignites whenever this hypothetical candidate gets elected.
Just wondering if there is a way for the positions of Radical Republicans to gain power before a Civil War rather than being mostly restrained afterwards.