I am buying oil as I type. Barrels and barrels of it! the more the better. It will hit $200 a barrel before his term is more than 2 years old. (If he makes it THAT far.)
Be cautious of Gold. Wind/Solar power, ethanol and bio fuels are also bad long term investments. They will drive land prices and food prices out of logical range. The illustrious one will then start freezing prices which will guarantee shortages and huge economic losses across the board.
Why do you think one should be cautious of gold? If Obama freezes the price of gold, it is equivalent to putting us back on the gold standard.