To me, if something is transparent, you can see through it. Windows are transparent, Saran Wrap is transparent, Glad Bags are transparent. President Obama is not transparent, he is opaque. He is not a window, he is a door that shuts us out. He is not Saran Wrap, he is Waxed Paper that covers up. He is not a Glad Bag, he is a paper bag that conceals its contents.
Take a look at the definitions of Transparent and Opaque below. You decide!
having the property of transmitting rays of light through its substance so that bodies situated beyond or behind can be distinctly seen,
easily seen through, recognized, or detected,
open; frank; candid; obvious
not transparent or translucent; impenetrable to light; not allowing light to pass through,
not shining or bright; dark; dull,
hard to understand; not clear or lucid; obscure