COMMUNIST Party USA co-chair Joe Sims is delighted Donald Trump used an Independence Day speech at Mount Rushmore to denounce his party: “Oh my goodness, we’re so back!” The leader of the so-called Free World’s extended rant against communism as “the greatest threat to our country” surprised onlookers: it has rarely been accorded that status since the end of the cold war. And while he did namecheck the Communist Party itself, Trump obviously had other domestic opponents in mind, including leftis