Tests ruled out a stroke and found no evidence of a seizure. Fetterman went to the hospital after feeling lightheaded at a Senate Democratic retreat.
The seat, which flips from Republican to Democrat, was vacated by retiring GOP Sen. Pat Toomey.
Winfrey brought on Oz as a regular guest on The Oprah Winfrey Show for more than five seasons in the early 2000s, giving him his big breakthrough.
