washington make final push toward crucial super tuesday vote super pacs back republican presidential candidate ted cruz buy 2.4 million advertise support eight state group tell reuters ads purchase keep promise various offshoots include radio television online late effort supporters cruz u.s. senator texas dislodge donald trump front-runner position tuesday critical 11-state republican nominate contest trump sweep contest could make stop path republican nomination impossible outside group support presidential candidates already spend 5.5 million advertise super tuesday state accord analysis reuters spend report file federal election commission friday morning super pacs permit raise unlimited amount money individuals corporations prohibit coordinate campaign support super pacs use fund expensive advertise budget campaign responsible staff grind organization cruz backers hopeful ads pull ahead trump cruz lock tight battle home state texas 155 delegate send republican national convention stake almost 600 delegate total state vote super tuesday super tuesday voters send message washington send serious prove conservative white house vote cruz say kellyanne conway president keep promise one group back cruz group spend 393,500 radio ads seven state also purchase 990,0000 television ads run georgia alabama tennessee arkansas oklahoma crucial state cruz narrow margins trump group also spend million digital ads eight state include minnesota far none outside group buy advertise report ginger gibson edit leslie adler article fund part sap independently create reuters editorial staff sap editorial involvement creation production exclusive super pacs back republican cruz buy 2.4 million ads eight state