Democrat John Edwards is exiting the presidential race Wednesday, ending a scrappy underdog bid in which he steered his rivals toward progressive ideals while grappling with family hardship that roused voter's sympathies but never diverted his campaign, The Associated Press has learned.The two-time White House candidate notified a close circle of senior advisers that he planned to make the announcement at a 1 p.m. EST event in New Orleans that had been billed as a speech on poverty, according to two of his advisers. The decision came after Edwards lost the four states to hold nominating contests so far to rivals who stole the spotlight from the beginning - Hillary Rodham Clinton and Barack Obama.The former North Carolina senator will not immediately endorse either candidate in what is now a two-person race for the Democratic nomination, said one adviser, who spoke on a condition of anonymity in advance of the announcement.Edwards waged a spirited top-tier campaign against the two better-funded rivals, even as he dealt with the stunning blow of his wife's recurring cancer diagnosis. In a dramatic news conference last March, the couple announced that the breast cancer that she thought she had beaten had returned, but they would continue the campaign.Their decision sparked a debate about family duty and public service. But Elizabeth Edwards remained a forceful advocate for her husband, and she was often surrounded at campaign events by well-wishers and emotional survivors cheering her on