"The great principle is the right of everyone to judge and decide for himself, whether a thing is right or wrong, whether it would be good or evil for them to adopt it; and the right of free action, the right of free thought, the right of free judgement upon the question is dearer to every true American than any other under a free government. ... It is no answer to this argument to say that [it] is an evil and hence should not be tolerated. You must allow the people to decide for themselves."
Stephen Douglas, 1858 in reponse to a comment that slavery was evil (the comment was made by Abraham Lincoln)
..and yes Douglas was a democrat.