If I recall correctly, Lincoln was in favor of abolition, while Douglas was in favor of leaving it up to the states.
More important was that Lincoln's Republican supporters were adamantly anti-slavery while the Northern Democrats (though not necessarily Douglas specifically) were only half-heartedly anti-slavery.
Can someone explain this?
You don't know the meaning of the word half-heartedly? Because in that case, it means that one is not fully dedicated, does not have one's whole heart in it, so to speak. I don't see what else could be unclear.
