Presumptive Democratic presidential nominee Joe Biden is starting to vet potential vice presidential candidates. Biden has said that his running mate will be a woman, and that she will be selected well in advance of the Democratic convention, now scheduled to begin — in-person or remotely — on Aug. 17. There is little evidence that vice presidential selections make a difference in presidential election results. The choice of running mate can, however, provide some clues as to how a presidential candidate wi … (read more)