After the 2014 elections, if the Senate is tied 50-50( with the 2 Independents caucusing with Democrats), the Democrats will still maintain the majority since Biden will be the tie breaking vote. Would there be any potential party flippers to toss power over to the Republicans? I can’t really think of anyone, especially knowing that Obama would still have a veto, and the 2016 Senate elections may not favor the Republicans, with all the Senators swept in from the 2010 Republican ass kicking election up for reelection.
A more interesting question might be if the Republicans eek out a 51-49 win. Are there Republicans who might flip to either Independent or Democrat to change the majority party in the US Senate.
I’m thinking a likely candidate might be Sen Mark Kirk from Illinois. He narrowly won in the 2010 Republican slaughter, he’s from heavily blue Illinois, his positions aren’t far right, and he could potentially face a difficult reelection campaign in 2016.
The last time this happened was in 2001 when Sen Jim Jeffords left the Republicans and flipped to Independent. Of course “9/11 Changed Everything” and the Democrats didn’t do much with their slim majority and lost the majority again in the 2002 elections.