The argument is that Mr Obama is more likely to replace departing "doves" on the Federal Reserve Board of Governors with other doves - ie, people who are more likely to support the current policy of pumping money into the economy for as it takes to bring down US unemployment.

BBC: US election: Four more years... of what?

The U.S. Geological Survey figures that at current oil prices, about 6 billion barrels would be worth pumping out.

CNN: Senator launches battle over drilling in Arctic refuge