Someone who always votes for the most authoritarian option.
Such a person would likely think of the authoritarians as the other guys. In both cases they may be someone who sees themselves standing against industrial capitalism and elite interests in favor of the small farmer - the Breckinridge voters being heirs of Jacksonianism. On the other hand the Breckingridge voter is likely to be in spirit fiercely independent (in spite of, in many cases, a dependence directly or indirectly on slavery) and having an attachment to the idea of ownership of property, which would not sit easily with socialist ideology.