34 Senators are up for reelection in 2016. If President Obama should not make a decision on a lifetime appointment to the Supreme Court in the last year of his term, the same goes for those 34 Senators. Of those 34 "lame duck" Senators, 24 are Republicans and 10 are Democrats. If they are excluded from the confirmation process, that leaves 30 Republicans and 35 Democrats (plus Bernie Sanders, who caucuses with the Democrats) who should get to vote on the nomination. By Mitch McConnell's logic, only those 66 should be able to decide if a nominee gets a hearing and vote to confirm the candidate.