Attorney and political activist Ralph Nader, 73, announced Sunday another run for the White House. Nader, who will turn 74 this week, said on NBC's "Meet the Press" that neither the Democrats nor the Republicans were addressing problems facing Americans, but handing the nation over to corporate interests instead.

"If the Democrats can't landslide the Republicans this year, they ought to just wrap up, close down, emerge in a different form," Nader said.

He drew the ire of Democrats in 2000 when he got about 2.7 percent of the national vote as the Green Party candidate, probably helping George W. Bush win his first term in the White House by drawing some of the Democratic votes. On Saturday, Barack Obama called Nader a "heroic" figure who "has done as much as just about anybody on behalf of consumers," while criticizing him for being egotistic.

"All the candidates -- McCain, Obama, and Clinton -- are against single payer health insurance, full Medicare for all," Nader said. He announced he wants to take on the "bloated military budget," labor law reform, repealing the Taft-Hartley Act, and corporate crime.

"In the last few years, big money and the closing down of Washington against citizen groups prevent us from trying to improve our country. And I want everybody to have the right and opportunity to improve their country," Ralph Nader told the press after announcing his candidacy on NBC's "Meet the Press."

Nader's most important work was done in the areas of consumer rights, humanitarianism and environmentalism. He helped fund many governmental and non-governmental organizations, including the Environmental Protection Agency (EPA), the Occupational Safety and Health Administration (OSHA), Public Citizen, and several Public Interest Research Groups (PIRGs) such as NYPIRG.

This is his fifth run for presidency. He previously ran for US President in every campaign since 1992, when he ran as a write-in in both the New Hampshire Republican and Democratic primaries, and other primaries. His parents, Nathra and Rose Nader, were Lebanese immigrants and Nader himself speaks Arabic fluently.