A 12-block-long surge of demonstrators, most of them Cuban Americans, flowed across the heart of Little Havana on Saturday to pump up support for a litany of struggles that stretched from the future of Cuba to the war in Iraq. With chants of ''Long Live America!'' and ''Long Live A Free Cuba!'' they applauded the Bush administration's tough stance against terrorism and likened Cuba's Fidel Castro to Iraq's Saddam Hussein. But the sea of red, white and blue flags along Southwest Eighth Street, known more commonly as Calle Ocho, also conveyed one distinct message: that the exile community in...