Perhaps President Lee's emancipation program would have worked out.
OOC:
1. It is extremely doubtful that Lee would have been elected President -- even if he had lived, which is stretching it already, he most likely would not enter politics.
2. Even if he did enter politics, it is extremely unlikely that he would have put forth an emancipation program. Lee was pro-slavery. Even though his primary motivation for fighting for the Confederacy was because that was the side Virginia fell on, he was still pro-slavery. Posthumous whitewashing of Lee is nothing but an attempt to make Southerners feel better about themselves, to give them a "hero" to look up to.
3. And even if Lee did survive, and did enter politics, and was elected, and did put forth an emancipation program -- there's
no way in hell it would succeed. People tend to forget that the Confederate States of America was founded on slavery. Its major industries were driven by slavery. It had the legality of slavery enshrined in its constitution, for crying out loud! It was, quite simply, a slaver nation. If Lee ever tried to free the slaves -- especially a mere decade and a half after the country was founded -- he'd lose all support and credibility, and fail epically.