See this post by Keith Poole, including graphs from earlier years. Poole writes:
Today, Posner would be the least conservative member of the Republican caucus in either chamber.
The Republican Party Has Left Richard Posner (in one graph)
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{ 3 comments… read them below or add one }
Does this scoring count baby-selling as conservative or liberal?
It looks like the dark red line for the 112th Senate is above zero on the y-axis at Posner’s spot on the x-axis. Why is that, if the most moderate Republican Senator (Snowe) “is about 0.05 units to the right of Posner,” as it says in Poole’s post?
Erik, I imagine it’s because the line is smoothed, but that may not be entirely correct.