Could Lieberman Hold The Senate's Balance of Power Post-November?

Assuming that the GOP holds all of its own seats, the party would need to win four Democratic open seats (Delaware, North Dakota, Illinois and Indiana) and knock off four Democratic incumbents (Arkansas, Nevada, Pennsylvania and Colorado). The crucial ninth seat would then come from one of four states: California, Connecticut, Washington or Wisconsin, where Democrats either have potentially vulnerable nominees or Republicans have surprisingly interesting candidates of their own. Lieberman certainly would relish the attention of being the "decider," and his decision surely would take into consideration whether he plans to seek re-election in 2012, when he will be 70.