Election of 1860

Is it reasonable to assume the counties that voted for Douglas in the North were sympathetic to slavery and those that voted for Bell in the South were sympathetic to abolitionism?

In short, no.

Bell was a slaveholder with no hint of abolitionist sentiment. The Constitutional Union Platform is here.

Counties that voted Douglas tended to be unsympathetic to slavery. They also tended to unsympathetic towards blacks, with little if any abolitionist sentiment. The northern Democratic platform is here.
 
Fiver answered your question on Douglas.

The counties that voted for Bell were slave-holders sympathetic to a compromise solution but ones that could not accept Douglas due to certain previous deviations from the pro-slave platform.
 
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