A minor point. The Democrats do have a bench problem. After you get past some ancient names, there is nobody who looks presidential. This problem may solve itself. Presumably Clinton wins this time and runs again in 2020. By 2024 there should be some new prospects. But there aren’t any now. The author’s list of possibles may be ready then, or not. But they would not be considered now if Clinton was run over by the campaign bus, nor for 2020 if she announced she would serve one term and would not select her successor.