Couldn't Sauron resurface in the future?

[PrinceOfTheHalflings]

Originally Posted by blantyr

As I understand it, if one hasn't the gift of man, if one has a certain very large amount of power, one can manifest one's self in a body, and live physically again. Sauron managed this once, but hadn't enough power after the destruction of the ring to do so again.

Sauron actually managed it TWICE while the Ring existed. His physical body was killed twice:

Once in the destruction of Númenor (SA 3319).

And then again 22 years later (SA 3341) when he was killed in battle by Elendil and Gil-galad. After this second death, Isildur took the Ring from him, and so without the Ring Sauron took far longer to reembody himself.

As for the original poster's question about whether Sauron's spirit might have affected some latter day human, like Hitler, well maybe.