He'll screw with oil supplies. The dems have stymied the Pesident's plans to wean us off of foreign oil at every turn, you'd think they were buddies with pineapple head. Oh, wait. They are. Never mind
We only get 14% of our oil imports from Chavez...however, that's 80% of his oil exports.
Oil is a fungible commodity in a worldwide market. His only choice is to sell oil or not to sell oil.
If he doesn't sell, it might raise the price 3 or 4 dollars a barrel.