An American parliamentary system with proportional representation wouldn't immediately or inexorably lead to a flourishing social democracy, but it would at least correct the overrepresentation of an ideological minority and cut down on intentional tactical economic sabotage.
FreedomWorks, which is funded primarily by very rich people, solicits donations from non-rich conservative people. More than 80,000 people donated money to FreedomWorks in 2012, and it seems likely that only a small minority of those people were hedge fund millionaires.