In 2010, the most left-leaning Republican senator voted more often to the right than the most conservative Democratic senator, according to National Journal voting-record analysis by Ron Brownstein.
Notes on verification
Corroborated by independent sources: Brookings analysis by Galston and Mann, and TalkingPointsMemo report on the original National Journal analysis by Ron Brownstein, both confirming the ideological non-overlap between parties in 2010.
Sources
- Our Reading Guide on Congressional Dysfunction - ProPublica (propublica.org)
- https://www.brookings.edu/articles/republicans-slide-right-the-parties-arent-equally-to-blame-for-washingtons-schism/ (brookings.edu)
- https://talkingpointsmemo.com/dc/new-report-ranks-most-liberal-most-conservative-members-of-congress (talkingpointsmemo.com)