It seemed like an outpouring of veteran anger against Donald Trump: over a dozen former service members protesting outside Trump Tower. But the reality was more complicated. The protest was actually a coordinated effort, led in part by the Hillary Clinton campaign, to embarrass her Republican rival for his failed efforts to raise money for veterans. It only looked like a grassroots demonstration. A spokesman for the demonstrators insisted they had no affiliation with any campaign. Later he said the protesters had reached out to the Clinton campaign for press contacts, but that’s all. Then the activist finally admitted that,...