Ryan Grim and Arhtur Delaney have a must-read article at the Huffington Post about the power struggle within the Democratic Party between progressive Dems and more centrist Dems. If long-term trends are any indication, this is a struggle that Progressives will eventually win.
DW-Nominate, the only ideological voting scorecard for members of all Congresses, all-time (1789--current), shows Democratic Senators moving, on average, decisively to the left over the past eighty years. While the trend was particularly pronounced during the 1960's, according to their methodology it continues to this day. In fact, hard as it may be to believe, the current Democratic Senate caucus (Lieberman and Sanders included), is ranked as the most left-leaning Democratic Senate caucus of all time.
First, here is the mean DW-nominate score for all Democratic Senators, by decade, starting with the 1931-1940 period. The number in parenthesis is the total number of Democratic Senators during that decade:
Democratic Senators, mean DW-nominate score by decade, 1930-2010
Scale is negative 1.000 to positive 1.000, with lower numbers indicating a more left-leaning economic voting record
1930's: -0.111 (334)
1940's: -0.096 (289)
1950's: -0.167 (269)
1960's: -0.271 (330)
1970's: -0.291 (299)
1980's: -0.303 (249)
1990's: -0.370 (248)
2000's: -0.394 (253)
Second, here is more recent detail on the trend, looking at each individual Congress (two-year period). Once again, the number in parenthesis is the total number of Democratic Senators during that Congress (including Independents Jeffords, Lieberman and Sanders; also including Senators who did not serve an entire two-year term):
More recent detail, 1989-2010
101st: -0.319 (56)
102nd: -0.331 (58)
103rd: -0.341 (57)
104th: -0.357 (48)
105th: -0.381 (45)
106th: -0.373 (46)
107th: -0.378 (51)
108th: -0.378 (49)
109th: -0.402 (45)
110th: -0.405 (51)
111th: -0.416 (60)
The trend through the decades, and over the last eleven Congress, is unmistakable: the party keeps moving to the left. The main factor in this trend has been the long, slow defection of conservative, southern Democrats out of the party, and the influx of liberal Senators from the northeast and west coast. It is also a reflection of ideological self-identification trends among the rank and file, as self-identified liberals are increasing as a percentage of the overall party:

For me, the lesson in these numbers is not that progressives should be satisfied with the current incarnation of the Democratic Party, or that we should take victory in the ongoing internal ideological struggle for granted. Instead, I take it as a rejection of the notion that there was some idyllic time in the past when Democrats were a "true" left-wing party. That time never existed. For all the mythology about how great the party was under FDR or LBJ, the truth is that Democrats were more right-wing back then they are now. This hits home even more when one realizes that the above numbers only measure ideology in terms of the economy, and do not take into account past internal party struggles on matters like civil right and the Vietnam War.
There was no glorious time in the past when Democrats were a "real progressive" party. There has actually never been a more progressive Democratic Party than its current manifestation. Whether that makes you excited, because the long-term trend shows we are winning, or depressed, because the most left-wing version of the party is not very left-wing, is probably a matter of individual orientation along the pessimism / optimistic linear binary.
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