Update: Hillary Concedes, Backs Obama

AP Photo
Sen. Hillary Rodham Clinton, D-N.Y., waves to supporters at the National Building Museum in Washington Saturday as she suspends her campaign for president.

Item: Ending her campaign, Hillary backs Obama /New York Times

More Info: Senator Hillary Rodham Clinton formally threw her support behind Senator Barack Obama on Saturday, clearing the way for Mr. Obama to head into the general election with a plan to challenge Senator John McCain in typically Republicans states. Mrs. Clinton, speaking here to an audience of advisers and supporters who had been invited to attend from across the country, used the final rally of her presidential campaign to end her barrier-breaking bid for the presidency and endorse Mr. Obama. She pledged that she would do what it takes to help Mr. Obama win the White House.

Question: What went wrong with Hillary Clinton’s campaign?