Ed Cox, New York state Republican chairman, is the man who, after noting that New York was the first state to cast more than 50 percent of its votes for Donald Trump, passed the microphone to Donald Trump, Jr., who proceeded to cast 89 of New York’s 95 delegate votes for his father — the votes that gave the man that most speakers referred to as Donald J. Trump a majority of delegate votes and made him the 2016 Republican presidential nominee.