CHICAGO — Rep. Alexandria Ocasio-Cortez (D‑NY) sought to appeal to the middle class during her speech on the opening night of the Democratic National Convention on Monday evening. The “Squad” Democrat highlighted her background as a bartender in New York City in her remarks, saying that “like millions of Americans,” her family was “just looking for an honest shake, and we were tired of a cynical politics that seemed blind to the realities of working people.”“Ever since I got elected, Republicans have attacked me by saying that I should go back to bartending,” she said. “But let me tell you, I am happy to, any day of the week because there is nothing wrong with working for a living.”Ocasio-Cortez, greeted by chants of “AOC,” argued that America has a “rare and p …