NEW YORK - Osama bin Laden is dead and General Motors is alive. That was Vice President Biden's message for Republican Mitt Romney in a campaign speech Thursday that blended a robust defense of President Obama's foreign policy record with a harsh attack on the presumptive Republican presidential nominee's positions.

Appearing before 500 students at New York University Law School, Biden said Romney approaches foreign policy with a Cold War mentality and is uninformed about the challenges facing the United States abroad. He said Romney lacked vision and had "distorted" Obama's record in a way that has been counterproductive to U.S. interests.

"If you're looking for a bumper sticker to sum up how President Obama has handled what we inherited, it's pretty simple: Osama bin Laden is dead and General Motors is alive," Biden said, arguing that Obama's decisions on both foreign and domestic policy had made the the nation safer.

Biden cast the former Massachusetts governor as an inexperienced foreign policy thinker who would delegate decisions to staff and advisers. He also criticized Romney as having a reputation for flip-flopping on issues.

"We know that when the governor does venture a position, it's a safe bet that he previously took or is about to take an exactly opposite position," Biden said, noting that Romney had originally supported setting a time frame for pulling U.S. troops from Afghanistan only to criticize Obama's plan to do so by the end of 2014.

Biden used Romney's own words against him, such as when Romney downplayed the significance of capturing bin Laden and when Romney said Russia was the United States' gravest geopolitical foe. "As my brother would say, 'Go figure,' " Biden said to laughs.

Romney adviser John Lehman accused Obama of a "gross abdication of leadership" that could have practical and political consequences. "Why is the United States under Obama abdicating its leadership for keeping stability in the world?" asked Lehman, Navy secretary in the Reagan administration, during a conference call Romney's campaign arranged with reporters before Biden spoke. "This is a serious crisis and perhaps could be the central issue in the campaign."

Lehman continued: "The Obama administration, in a very studied and intentional way, is withdrawing from leading the free world and maintaining stability around the world - what Obama calls leading from behind. But the reality is it's opening up huge new vulnerabilities."

Obama has not described his foreign policy as "leading from behind." Republicans used the phrase to chastise Obama for his handling of last year's uprising in Libya.

Biden recited Obama's foreign policy achievements, noting that he ordered the attack that killed bin Laden and fulfilled a promise to end the Iraq war. He said Obama repaired alliances with other nations, particularly with geopolitical partners in Europe and Asia.

He pushed back particularly hard on Romney's attacks on the Obama administration's handling of Iran and Israel, two areas where Republicans have been sharply critical of the president.

On Iran, Biden said Romney's call for sanctions and a U.S. military presence in the Persian Gulf to prevent Iran from developing a nuclear weapon simply mirrored Obama's approach. "The only step we could take that we aren't already taking is to launch a war against Iran. If that's what Gov. Romney means by a 'very different policy,' he should tell the American people," Biden said.

He also said Obama has stood firm in support of Israel and said Romney's tactic was to "distort and mischaracterize" Obama's position.