Ralph Nader said Sunday he will run for president as a third-party candidate, criticizing the top White House contenders as too close to big business and pledging to repeat a bid that will “shift the power from the few to the many.” Nader, 73, said most people are disenchanted with the Democratic and Republican parties due to a prolonged Iraq war and a shaky economy. The consumer advocate also blamed tax and other corporate-friendly policies under the Bush administration that he said have left many lower- and middle-class people in debt. Nader also ran as a third-party candidate in the 2000 and 2004 presidential elections. He is still loathed by many Democrats who call him a spoiler and claim his candidacy in 2000 cost the party the election by siphoning votes away from Al Gore in a razor-thin contest in Florida. Nader vociferously disputes the spoiler claim, saying only Democrats are to blame for losing the race to George W. Bush. (Fox News contributed to this story.)