columbia s.c. republican presidential candidate jeb bush say saturday suspend campaign disappoint finish south carolina primary bush also fare poorly early contest iowa new hampshire say race hard fight voters three state speak appear jab republican frontrunner donald trump bush accuse lack ideas former florida governor say ideas matter policy matter bush son former president george h.w bush brother former president george w. bush enter 2016 campaign favorite unable convert sizable fundraise advantage success poll republican jeb bush end 2016 presidential campaign