2/6 (the suffrage and abolitionist points). The fifth comment fascinates me, because my historical understanding was that Democrats even in the 1800s were more accepting of immigrants - that is, Irish Catholic immigrants. One of my few gripes with the antebellum GOP is their close association with nativists and xenophobes, and that being abolitionist and nativist was somehow a package deal much of the time.
Considering this is the 1856 election, I think this would have been a Know-Nothing Party cartoon.
Even so, the nativist line of attack would have worked far more effectively against the Democrats than the Republicans, given that Democrats even then were much more welcoming to (Irish Catholic) immigrants.