In the past I have argued that Democratic losses in 2010 will move the Congressional Democratic caucuses to the left. This is because, according to my argument, most of the Democrats who will lose in 2010 will be in the right-wing of the party. Thus, the remaining group of Democrats will be, on average, more left-wing than the current group of Democrats.
However, at least as far as the Senate is concerned, it turns out that isn't the case. Despite prominent center-right Senators such as Blanche Lincoln, Arlen Specter, and Evan Bayh set to leave the Senate by either retirement or the ballot, the Democratic Senate caucus will not see any significant ideological shift in 2011.
For this analysis, I measured the current 59 members of the Senate Democratic caucus according to three oft-cited ideological voting scorecards: Progressive Punch (crucial votes), and DW-Nominate and National Journal. I recalibrated all of those scored along a 0.0 to 100.0 scale, with 0.0 being the most conservative and 100.0 being voting the most progressive. Only scores for 2009-2010 were used.
According to this analysis, the current 59 members of the Senate Democratic caucus have a mean progressive score of 74.7. Debbie Stabenow stands at the median of the caucus, with a score of 78.1.
Removing the Senators who are retiring (Bayh, Burris, Dodd, Dorgan, Kaufman) and the Senators who are currently trailing in their bid for re-election (Bennet, Lincoln, Reid, Specter), the caucus mean would become 75.5. Patty Murray would become the median, at 78.3.
Here is the chart I used, with departing members in red:

The slaughter of the moderates would thus move the Democratic Senate caucus less than 1% to the left. The size of the shift would be the equivalent of the difference between Debbie Stabenow and Patty Murray, whatever that is.
Further, if Barbara Boxer were to lose re-election, which is entirely possible, the Democratic Senate caucus would actually shift slightly to the right on the mean, and remain with Debbie Stabenow on the median.
So, if you are hoping that a Democratic wipeout in 2010 will move the party to the left, think again, at least when it comes to the Senate. Setting fire to the forest will just result in having the exact same forest, only with fewer trees. The Democrats who remain in the Senate will be, on average, virtual ideological twins to the ones who left.
I will try to whip up an equivalent analysis of the Democratic House caucus, post-2010, tomorrow.
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