To me Clement Vallandigham and company should be given more attention in the history books than they tend to get. It's easily possible for them to try to and end up succeeding in breaking up the USA rather than letting the USA win the war if the price was abolition of slavery. Both sides in the Civil War dealt with strong anti-war movements, it's a whole shadow-side of the war often neglected in favor of the first two years of the fighting (not so much the fighting of 1864-5).