I like that idea, actually. I was iffy on both 'Pro-Admin' and 'Rebellion', so that helpsVery cool! As for names for the Breckinridge Democrats... you could maybe try "Constitutional Democrat" to give it a feeling of law and order. As for Douglas's faction, might I suggest the label of "Union Democrats" because of the idea that, as you said:
While Breckinridge plays the name game while ultimately provoking his opponents, Douglas comes in with... well... a better name... Anyway, hope this is helpful!