MAYBE THEY DEFINE BALANCE DIFFERENTLY IN UNICORNLAND?:

Senate Liberal Scores (National Journal)

Obama, Barack, D-Ill. 94 94 92 95.5
Whitehouse, Sheldon, D-R.I. 94 88 94 94.3
Biden, Joseph, D-Del. 94 86 98 94.2
Sanders, Bernie, I-Vt. 90 88 98 93.7