A CBS “60 Minutes” host actually forced Vice President Kamala Harris to field some substantive questions, and it revealed how over her head she is in seeking the highest office in the land. After her appearances on MSNBC and at ABC News’ presidential debate last month, when the media personalities involved appeared to do all they could to prop Harris up, it was refreshing to see CBS News correspondent Bill Whitaker actually press the Democratic presidential nominee for some answers. One topic he broached was why Harris is alienating tens of millions of Americans by trying to label Republican n…