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Obama promises to cut U.S. reliance on oil

He said that the problem went deeper than the Bush administration - to the oil price shocks in the 1970s - but that oil and gas companies had been able to use "campaign dollars and corporate lobbyists to block reform."

Obama promised to invest $150 billion over 10 years to establish a "green energy sector" that would develop solar, wind, and biodiesel energy.

"Only Barack Obama would rail against the very lobby-driven energy bill that he himself voted for," said Tucker Bounds, a spokesman for the McCain campaign. Obama said he voted for that "far from perfect" 2005 bill because it included incentives for renewable energy.

While taking audience questions, Obama praised Thursday's Supreme Court decision to allow foreigners detained at Guantanamo Bay on suspicion of terrorism to challenge their imprisonment in federal court. Enforcing habeas corpus rights, he said, is the "essence of who we are."