Ralph Nader says he will run again as an independent for the US presidency. The anti-establishment consumer advocate made the announcement in a televised interview on Sunday. 

Mr Nader was accused by many Democrats of handing the presidency to George W Bush in the November 2000 elections. He ran again unsuccessfully in 2004. 

Senators Barack Obama and Hillary Clinton are vying for the Democratic ticket. Senator John McCain is almost certain to run for the Republicans. Nearly three million Americans - more than 2% of the vote - backed Mr Nader when he stood as the Green Party candidate in the 2000 presidential election. 

That election was so close that a small proportion of those votes - particularly in the key state of Florida - would have put Al Gore in the White House.