To illustrate them, Chait imagines what would happen if one of the conservative Supreme Court Justices died unexpectedly:
It may seem implausible that Republicans would simply refuse to allow Obama to appoint any justice to such a vacancy. That is only because things that haven’t happened before are hard to imagine. But such a confrontation is not only a logical outcome but the most logical outcome. Voting to flip the Supreme Court would be, if not a political death warrant for a Republican Senator, then certainly taking one’s political life into one’s own hands. Politicians do not like political death warrants — certainly not for the benefit of the opposing party’s agenda.
The modern pattern in American politics is that tactics that are legally available, but never used for reasons of custom, eventually become used. The modern pattern is also that the Republican Party, which is the most ideologically cohesive and disciplined party, leads the way. McConnell did not create this pattern, but he is an important innovator. … It stands to reason that if and when new powers are laid at his disposal, McConnell will once again deploy them creatively. A potential Supreme Court crisis, in which the Senate simply refuses to let the president fill a vacancy on any remotely normal terms, is one possibility. Others may be brewing at this moment deep within McConnell’s extensive imagination.