In the deli department and across grocery aisles, Kraft Foods and ConAgra battle away, vying for consumer attention. It's Hebrew National hot dogs vs. Oscar Mayer wieners, or Reddi-Wip against Cool Whip.  But peace has broken out on the media front as the food giants join forces to co-promote Kraft's Velveeta cheese and ConAgra's Ro-Tel canned tomatoes.
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