Obama used the game to express respect for his Republican rival, John McCain, and underline his stances on some issues.

"I'm going to give you a couple of words," the Fox TV journalist said. "And then you just tell me what you're thinking about."

"I will do my best," Obama answered.

NAFTA (North American Free Trade Agreement): "Mixed bag."

Wall Street: "Money."

Sovereign Wealth Funds: "Caution."

Iran: "Threat."

Exxon Mobil: "Profitable," said Obama, laughing.

OPEC (Organization of Petroleum Exporting Countries): "One word, for OPEC I would say it is independence. The association I have there is we've got to free ourselves from dependence on OPEC.

Senator McCain: "Honorable."

Obama also said that he was determined to run a positive presidential campaign, even though his verbal clashes with McCain have begun to generate some bad press for him.

"There's no doubt that sometimes the testosterone kicks in and you start getting more combative than you need to," Obama said.

A Chicago resident and enthusiastic basketball fan, Fox asked Obama's opinion on the upcoming National Basketball Association (NBA) draft, in which professional teams choose top younger players that want to join the professional league. The Chicago Bulls have the number one draft pick.

"I think Derrick Rose is the man," referring to the star of Memphis University's team that made it to the collage basketball championship game.

"I think he'll be a great point guard in the NBA. And he's from Chicago. So how can you resist him there?"

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