You're mostly right, but there were some Democrats of that period who were definitely pro-economic interventionVic 2. As I recall, it goes:
Southern Democrats - State Capitalist
Democrats - Interventionist
Republicans/Whigs - Laissez-Faire
This is completely ass-backwards and is just because they designed the parties with an assumption that Conservative = More control and Liberal = less control.
That dynamic may be true in Europe, but it's not in the Antebellum United States. The conservative party, the Democrats, were laissez-faire (very little intervention) and the Whigs/Republicans, the liberal party, were very pro-intervention. Very lazy, shows a minimum of research on the part of the developers.
I checked and the Whigs are correctly labeled interventionist although the Republicans aren't.
New England Republicans were pretty conservative and less pro-government intervention, and there were definitely liberal Democrats. But I think it's mainly to represent FDR's New Deal policies. I think "Market Liberal" would fit the Republicans better really. Democrats can stay at "Social Liberal" since that's what they were and as a whole weren't as left as some minor political groups like the Socialist Party.This was also true in Hoi 3. Republicans were social conservatives and democrats were social liberals IIRC, but that political realignment didn't happen until the 60s.
They seem to have gotten better at it though.