Lunch meat purveyor Hormel Foods is making a run at the supermarket's middle aisles, buying the Skippy peanut butter brand for about $700 million.The Austin, Minn., company, also known for its Spam canned ham, is acquiring Skippy from Unilever's U.S. operation, which also owns brands such as Vaseline and I can not Believe it is Not Butter!Hormel, whose main strength is its domestic sales of Jennie-O,