Mitt Romney has just one job going into the last stretch of the presidential campaign. He has to connect with people who voted for Barack Obama in 2008 but are disappointed with the president now. He has to assure them that they didn’t make a mistake back then, that it wasn’t crazy or stupid to believe Obama’s promises, but that things just haven’t worked out. And he has to convince them it’s OK to choose a new candidate this time around; they don’t owe Obama another vote. The situation facing Romney is hard for some Republicans to comprehend. They didn’t …