Both parties make promises to their bases. But while the Democratic establishment more or less tries to make good on those promises, the Republican establishment has essentially been playing bait-and-switch for decades. And voters finally rebelled against the con.
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One possible explanation is the decadence of the G.O.P. establishment, which has become ingrown and lost touch. Apparatchiks who have spent their whole careers inside the bubble of right-wing think tanks and partisan media may suffer from the delusion that their ideology is actually popular with real people. And this has left them hapless in the face of a Trumpian challenge.
Worth a read.