He has stated that there is nothing the Republicans can offer him to get him to switch.
And you figure if he decided not to vote with the Dems, but stayed independent, that still gives the Dems. the Senate by a 50-49 vote. Remember when Jeffords left the Republican party, it gave the Dems. a 50-49 advantage and control.
Any DINO senators who could switch to the Repubs?
Are there any conservative or moderate Democrats left?
Not even Majority Leader? (I don't think it will happen either.)