Rep. Maxine Waters — the California Democrat who is one of President Donald Trump’s most vocal and prominent haters — will be dining on a plate full of crow this weekend after her prediction that the president was bluffing on his threat of Mexico tariffs backfired in spectacular fashion. All eyes were on the president the past few days as everyone waited to see what would happen regarding his threat to impose a 5 percent tariff on Mexico. One set of those eyes belonged to Waters, who tweeted Friday morning that “Dictator Trump” wouldn’t follow through on his threat. “Spineless...