You could disagree with his method, but I found the article interesting. The point is to explore how a Lieberman loss would affect the senate's balance.
http://www.prospect.org/web/page.ww?section=root&name=ViewWeb&articleId=11794 ...So here, to me, is how it shakes out. Of the 44, I call 16 Liberals, 14 Moderates, and 14 Tweeners. Obviously, some of this is subjective, so for the sake of transparency, and so everyone can pick me apart, here’s my breakdown (deviating from style and using last names only, for the sake of speed):
Liberals: Kennedy, Reed, Boxer, Sarbanes, Lautenberg, Harkin, Durbin, Kerry, Mikulski, Levin, Leahy, Feingold, Dayton, Dodd, Wyden, and Murray (barely, but she’s an 81.3 and is best known, to me at least, for pushing Plan B).
Tweeners: Biden, Clinton, Rockefeller, Akaka, Kohl, Reid, Schumer, Cantwell, Menendez, Feinstein, Dorgan, Byrd, Stabenow (high-ish score of 86.3, but affiliated with the DLC), and Obama (82.5, but has challenged some liberal orthodoxies in a high-profile way, e.g. his recent religion speech, and he voted for the tort “reform” bill, which can fairly be called a significant vote).
Moderates: Carper, Bayh, Inouye (surprisingly low 69.5), Lincoln, both Nelsons, Bingaman, Baucus, Salazar, Pryor, Conrad, Landrieu, Johnson, and Lieberman...