Excitement peaked when Winfrey entered the room at an events center in Farmington Hills, where invited guests gathered for a "Celebration of Unity" reception.

The evening campaign events follow an explosive report that Lt. Gov. Mark Robinson of North Carolina, the Republican nominee for governor, once called himself a “black NAZI!” and defended slavery on a pornographic forum.

The Harris campaign event featured tearful moments as those in the audience shared their personal stories about an abortion ban and a school shooting.