Oprah Winfrey took the stage Monday night and roused supporters of Vice President Kamala Harris in the critical battleground state of Pennsylvania, where she warned that the country is on the “precipice of danger,” and shared what’s at stake in Tuesday’s election. “We don’t get to sit this one out. If we don’t show up tomorrow it is entirely possible that we will not have the opportunity to ever cast a ballot again,” Winfrey said at a packed outdoor rally in Philadelphia. During her brief remarks, just before she introduced Harris on stage, Winfrey spoke about what a vote for Harris would mean…