What happens in Cleveland won’t stay in Cleveland. Donald Trump could get a big bump at this week’s Republican National Convention — if, I argue, he puts forth a constructive, unifying message. He needs to. While polls show a close race, Trump is the underdog and for now owes his momentum to public anger with Hillary Clinton. When 56 percent of Americans, including 30 percent of Democrats, say she should have been charged with a crime over her email server, she’s got a major problem. Whatever happens, it will be interesting to see the effects of two weeks of convention news coverage. The last time the two parties’ gatherings were back to back was … 1956.