By the time Sen. Mitch McConnell (R-KY) moves in to the majority leader's suite just off the Senate floor, he'll likely be leading a caucus of 54 Republican senators.
That means he'll need six Democrats to break filibusters and achieve the magic 60-vote threshold required to pass controversial legislation through the Senate, such as hacking away at Obamacare or approving the Keystone pipeline.
There are six Democrats who are most likely to, in the interest of bipartisanship, join Republicans on some ke
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