Moderate Senate Republicans Fall Off Their Own Cliff

Stuart Benjamin at the Volokh Conspiracy: The most commonly used scores for ideological distance are DW-Nominate scores, based on representatives’ actual votes. These measures reduce various flavors of “liberal” and “conservative” to a single metric, but they are the scores most widely used and trusted by political scientists and political commentators because they measure virtually all the actual votes in a careful and rigorous way. As many people have noted, there used to be lots of ideological overlap between the parties, and lots of moderates in both parties, but there is less overlap, and in particular there are fewer moderate Republicans.