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      Holiday shopping for many is no longer a sprint, but a marathon

      (AP) -More than a dozen retailers from Wal-Mart to Target to Toys R Us opened on Thanksgiving Day and some stayed open overnight. Analysts say Thanksgiving shopping is becoming so popular that it's starting to take a bite out of Black Friday sales.

      The Chicago research firm ShopperTrak says last year sales on turkey day were $810 million, an increase of 55 percent from the year before.

      And on Black Friday last year, sales dropped 1.8 percent from the year before.