I don’t know what will happen in the midterm elections. But if Republicans pull it out – that is, if they lose the popular vote by a small enough margin that gerrymandering and the geographic concentration of nonwhite voters frustrate the public’s will – it will be the result of tribalism. It won’t be because the G.O.P. won voters over with a tax cut.That’s not what they expected. The people who rammed through a massive tax cut without hearings or analysis thought they could sell it to voters as free money for everyone; never mind the big bucks for corporations and the wealthy, look at the extra cash we’re putting in your pocket.