A major Study Reveals how well they work. Whats really in your food. Turns out that Parmesan Cheese at the Grocery Store might not be what you think it is. What you should know. And the power couple who hit the jackpot, half a billion times over. Nightly news begins right now. From nbc news World Headquarters in new york, this lester holt. Good evening. A Surprising Development in the race for president leads our news tonight. A brand new nbc news wall street journal poll shows donald trump has slipped from the top spot nationally falling behind ted cruz among republican primary voters. Our poll has cruz now ahead at 28 with trump at 26 and marco rubio rounding out the top three at 17 . Trumps tumble from the top spot comes as he and cruz trade threats, dares and accusations ahead of saturdays south still leads. Nbcs Hallie Jackson has late details. Reporter tonight a stunning shift in the republican race, a new national frontrunner, ted cruz. Its tremendously encouraging to be leading
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