His campaign’s snapshot of swing-state polling points to warning signs beneath the surface. The Trump campaign released a polling memo on October 13 contending that he was ahead by two points in the seven swing states. A close read of what the memo said — and didn’t say — nonetheless shows that the race still hangs by a thread. The memo was authored by campaign chiefs Susie Wiles and Chris LaCivita and polling maestro Tony Fabrizio. It argues that their polling shows that...