NEW : Clinton says global aid can help Haiti become better place than it was before quake . NEW : Elsewhere , a food drop by U.S. helicopters in Port-au-Prince became a chaotic scene as hundreds of Haitians without food and water for four days rushed the boxes of aid being shoved out of the open doors . Haitian President Rene Preval calls for international assistance to rebuild country after earthquake. NEW : Amid chaos , signs of progress , including aid distribution sites , hospitals . Ex-Presidents Clinton and George W. Bush to lead fundraising effort for Haiti .
NEW : Clinton says global aid can help Haiti become better place than it was before quake . NEW : Haitian President Rene Preval calls for international assistance to rebuild country after earthquake. NEW : Amid chaos , signs of progress , including aid distribution sites , hospitals . Ex-Presidents Clinton and George W. Bush to lead fundraising effort for Haiti .