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U.S. Eateries Push for Obesity Lawsuit Protection By IRA DREYFUSS    WASHINGTON (AP) -- Bills to protect restaurants and food companies against lawsuits by people who claim the meals or snacks made them fat are moving ahead in the states like hamburgers passed out a drive-thru window.    Measures known as "cheeseburger bills" bar people from seeking damages in court from food companies for weight gain and associated medical conditions, including heart disease and diabetes... 