Because Bish accomplished so much when his party didn't. Control Congress...
2013/2014 is going to be hilariously bad if Republicans win Congress this year. Weakening or killing the filibuster in 2009 should have been the first step if Democrats were thinking long-term. I doubt they'd do it in 2013 now even if they held the Senate this year considering there's a big chance they could lose it in 2014.
Say what you want about Republicans, but at least they play to win. There's something really dissatisfying about elections between weak, spineless Democrats and batsh*t crazy Republicans.