Trump and Oprah, as I recall, were somewhat close early on. Both in TV, ran in the same circles. Oprah got Dr. Oz his start. Its not a far stretch to say that Trump and Oz might be friendly.

I doubt Trump would endorse someone swampy, but I don't know. Take it at face value, Oz might owe Trump some key votes if he got in. But lets see how it plays out.