The US Senate’s narrow ideological range cannot fairly test the far-left ideologue hypothesis

Evidence

The second problem stems from the limited ideological range of positions represented in the United States Senate. A defender of the ideologue hypothesis could argue that there were not enough representatives of the ideological left to provide a fair test of the hypothesis (i.e., there is no influential socialist or communist party in the United States). This line of argument, however, gains force only to the extent its advocates can offer an explicit and defensible (as opposed to ad hoc) rationale for why the ideologue hypothesis applies only to the far left. How far must one go to the socio-political left and why? — John T. Jost and Jim Sidanius, Political Psychology, 2287

Categorization

• XREF: connects to: The Law of the Sea Treaty remains unratified by the US Senate. — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin: The Making…, 1834; Majority-supported U.S. policies pass only rarely, making countermajoritarian entrenchment tests unusable — Daryl Levinson and Benjamin I. Sachs, Political Entrenchment and Public Law, 421