Shouldn't he be invisible?
There's a lot of debate as to when and how the Ring turns people invisible.
It certainly didn't turn Tom Bombadil invisible when he wore it. And there is a lot of circumstantial evidence that it didn't turn Sauron invisible while he was wearing it.
However, it pretty clearly turned Isuldur invisible when he wore it (otherwise the story of him donning it and then jumping into the anduin to escape the massacre of the Gladden Fields makes no sense).
And we know for sure that it made Smeagol/Gollum, Bilbo, Frodo and Sam invisible when they wore it.
And that is all the people who ever wore it, as far as we know.
There are a couple of options:
(1) Those whose who exist in both the "Seen" and "Unseen" worlds (e.g. the Maia (e.g. Tom Bombadil and Sauron) and the Eldar) are not affected by the invisiblity power, since that power is merely the effect of the wearer being transferred to the Unseen world and these beings are already "there".
(2) Powerful beings can "turn off" the invisibility power.
Intersiting side note, one of the things I really liked about the film was this:
When Frodo was in the Unseen realm (wearing the ring and later when the morgul wound had almost turned him into a wraith), *almost* everyone looked different. Normal people and hobbits were shadowy, indistinct figures. Eldar were idealised figures of light in fine clothes (Arwen when she turns up, is wearing green riding clothes and looks normal (if beautiful); but to Frodo she is a figure wearing a fine gown and bathed in light). Nazgul were not invisible but were walking corpses. What was terrific was this: In the Unseen world (as shown in the fight on weathertop) Aragorn appears *exactly* as he does in the Seen world! Now that is just beautiful! It shows at once the greatness of the Dunedain (their power of the Unseen) but at the same time shows the difference between them and the Eldar (the "earthiness" of their power fersus teh "otherworldlyness" of the power of the Eldar).
So, question: If Aragorn put on the Ring, would he be invisible? We know that Isuldur was turned invisible, but there is a lot of circumstantioal evidence that Isuldur wasn't a particularly "spiritual" guy for a Dunedan - unlike his brother, Anorian and his father, Elendil (notice the similarity here with the relationships of Borimir to his more "spiritual" brother, Faramir and his very "spiritual" father, Denethor).
So, maybe George Bush wasn't human in the first place?