Remember, tyrants, to keep the masses docile you must follow through on even the wildest rumors of bread and circuses. Clearly, the Democrats need to get better at this. Amid speculation of a high-profile guest set to make a surprise appearance at the Democratic National Convention in Chicago on Thursday, viewers and convention goers discovered to their chagrin that those rumors — like everything else Democrats say — had no basis in fact. Social media figures and establishment outlets spread rumors of the alleged guest’s identity. For instance, in a 19-second clip posted to the social media …