From Belfer Center for Science and International Affairs:

209 Some scholars dispute the value of analyzing DW-NOMINATE scores, arguing that the underlying methodology exaggerates ideological differences between the parties. Instead, they argue that party leadership has become more effective at controlling the Congressional vote calendar. For more, see: Wallach and Wallner: https://www.rstreet.org/2018/06/15/congress-is-broken-but-dont-blame-polarization/

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