Beyoncé? Taylor Swift? Harris racks up celeb support as campaign courts young, Black voters

The rumors are flying over which huge music star might show up for Vice President Harris's coronation Thursday night as the Democratic presidential nominee.

Will it be Beyoncé, the Grammy-winning icon whose "Freedom" is the unofficial theme song of the Harris campaign?

Or maybe Taylor Swift, whose European tour just ended and who Democrats have long seen as a huge potential endorsement this cycle? 

The rumors alone speak to a growing truth: Harris's month-long campaign...