It recognizes that disruptions hurt incumbents.
It recognizes that the crackdown in Washington DC on June 1 backfired.
It does not want a replay.
"American carnage" is a political attack for a challenger, not a political defense for an incumbent.
He's confronting a responsibility he cannot dodge, at a time when his only political trick has ceased to work for him.
The rescheduling confirms how fast Trump's strength is ebbing - and that he (or his campaign) knows it.
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