The one sure bet from Tuesday’s US Senate runoff elections in Georgia is that they will produce a Senate precariously balanced between the two parties, accelerating a fundamental change that is simultaneously making the institution more volatile and more rigi…

Counterintuitively, narrow majorities are bad for bipartisanship, because when control of the majority is constantly within reach in the next election it gives the side that is out of power less incentive to cooperate and more incentive to obstruct, to make the party that is in power look bad.
Adam Jentleson, author of “Kill Switch”