Democrat Barack Obama (web|news|bio) told voters Saturday he would push an aggressive economic agenda as president: cutting taxes for the middle class, raising taxes on the wealthy, pouring money into "green energy" and requiring employers to set up retirement saving plans for their workers. Campaigning in Pennsylvania, a key battleground in the fall campaign, Obama said he would take a much more hands-on approach than would Republican John McCain (web|news|bio) . He again criticized McCain's proposal for a temporary halt in the federal gasoline tax. It would "actually do real harm," Obama said, by reducing revenue for road and bridge construction even as oil companies make record profits. Speaking to about 200 people in Wayne, a Philadelphia suburb, Obama made no new proposals but emphasized earlier ones in light of rising gas prices, inflation and job losses. They include a $1,000 tax cut for most working families; a new Social Security tax on incomes above $250,000; a "windfall profits" tax on oil companies; a $4,000 annual college tuition credit for those who commit to national or community service programs; and an end to income taxes for elderly people making less than $50,000 a year.

Obama said he could pay for his programs by eliminating the Bush administration's tax cuts for the wealthy, winding down the Iraq (web|news) war and spending more on alternative energy programs that eventually will save money.

He said employers should be required to set up retirement saving plans for workers even if they contribute no money to them. Workers would automatically be enrolled unless they choose to opt out, he said. That way, he said, "most people will save more."

He also vowed to spend $150 billion over 10 years to establish a "green energy sector." It would require greater fuel efficiency in cars and devote more money to solar, wind, and biodiesel energy.

Taking audience questions, Obama praised Thursday's Supreme Court decision to allow detainees at Guantanamo Bay to challenge their imprisonment in federal courts. Enforcing habeas corpus rights, he said, is "the essence of who we are."

Even when Nazis' atrocities became known in the 1940s, he said, "we still gave them a day in court" at the Nuremberg trials. "That taught the entire world about who we are," he said.

McCain sharply criticized the court ruling, saying it would hamper the war on terrorism.

Obama said McCain would be likely to appoint Supreme Court nominees who would allow states to outlaw abortion. "You're just one justice away from that," he said, alluding to the court's narrow ideological divisions.

Democrats have carried Pennsylvania in the last four presidential elections, although narrowly at times. Obama lost badly in the primary here to Hillary Rodham Clinton (web|news|bio), and he is struggling to attract white working-class voters who heavily favored her.

Should McCain manage to win Pennsylvania and its 21 electoral votes, Obama would have to compensate in other areas, such as in the Rockies, where Republicans have done well in recent campaigns.

Written By CHARLES BABINGTON

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