Also, I feel I should point something out since it seems to be overlooked quite a lot by some of our American members: excessive social liberalism such as marijuana liberalisation is not a fundamental part of social democratic ideology. While I may well stand corrected on this point, I don't think any European social democratic party actually advocates for its legalisation - this sort of thing is chiefly in the domain of liberals in Europe, who are a completely different beast.
Keep in mind that although the SF is certainly more European than American, the Americans of the SDP at least (basically the Congressional Progressive Caucus and the Greens) regard marijuana legalization as a major issue, and the ex-PES members are more preoccupied with economic issues than social ones, so it was able to become part of the SDP platform.
Well, I'm interested to see how he can reconcile the two very different traditions of American and European liberalism in one party.
A Solar Liberal Party would actually probably remained relatively united, since UHC is something of a sacred institution in Europe and Canada, so the more socialised American liberalism could find its way into an SLP. There'd be struggles, but overall I think they'd do okay.
And it would be nice to see what sort of--for lack of a better term--futuristic political issues that they're dealing with and how they fit in TTL's political spectrum and parties.
I think some major political issues would be how to deal with of the Titanians, Europans, and Enceladans (the Solar Socialist Party, and the SDP, the a hypothetical Solar Liberal Party, and the Solar Greens in particular would probably be friendly towards other species, while the Conservatives, a hypothetical Social Credit Party, the Farmers' League and some really far-right people would probably be hostile towards other species), Robotic labour (mostly an issue the Solar Greens are preoccupied with; TTL's equivalent to nuclear power), and the migration of Earth farming to Venus (leftists are against it except for the Farmers; League, while rightists, and the Liberals are against trying to stop it, and the Farmers' League is very strongly for it, in no small part due to the fact that the Farmers' League is almost entirely composed of the VFL)