Answer:
Stephen Douglas and John Bell were considered a moderate candidate compered to J. Breckenridge and Abraham Lincoln because Douglas was a moderate on the slavery issue who favored "popular sovereignty", so he was considered moderate and they made slavery illegal in all U.S. territories,
John Bell who did not address the issue of slavery at all, they consider him as called up in the canvass and discussed for party purposes, were conservative in their feelings, the Union would not do anything in our popular elections that the people will open their eyes to the mischief
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