It was one of the hottest days of the year in New York City on Saturday – but as Alexandria Ocasio-Cortez took to the stage in the Bronx, you wouldn’t know it. At a rally to support Jamaal Bowman, the progressive Democrat facing a primary campaign that has seen pro-Israel lobbying groups pump more than $15m into the race, Ocasio-Cortez was amped up. Bowman’s fellow progressive member of Congress – one of America’s most recognizable politicians – sprinted on to the stage and jumped around to a Cardi B track, drawing cheers and applause from the crowd. “Let’s go, Bronx!”...