top of the hour. want to get you up to seed. newt gingrich gets ready to pull the plug on his presidential campaign. sources telling cnn gingrich is going to officially end his run for the white house next week, throw his support behind mitt romney. gingrich expected to help republicans try to win back the senate and hold onto the house. here is what he said earlier today. we re going to stay very, very active. we re working out the details of our transition and we ll have information for the press the next couple days, but i am committed to this party, i am committed to defeating obama. we will find ways to try to be helpful. i do think it s pretty clear that governor romney is only going to be the nominee and we ll do everything we can to make sure he is, in fact, effective. a major retailer in south korea is pulling u.s. beef from its shelves. the store is stopping sales after a single case of mad cow disease was confirmed in california. the u.s. agriculture department
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speak on the 2-year-old arizona law due to be challenged tomorrow at the u.s. supreme court. more on that and surprising facts from the u.s./mexican border. there s little drama but don t tell voters. voting is under way in republican primaries in rhode island, connecticut, delaware, pennsylvania and new york. mitt romney, of course, appears to have the nomination in the bag. santorum is dropped out, but his name is on the ballot. for now, gingrich and ron paul vowing to fight on. romney right now has 695 of the 1,144 delegates needed to clench the nomination. president obama focusing on education. this morning, he honored the national teacher of the year and the finalists at the white house. these are the kind of teachers who change lives forever. i wouldn t be here today if it were not for teachers like these who challenged me, pushed me and put up with me and inspired me and set me straight when they had to. the president heads to college campuses in three battlegrou