Berkshire Hathaway CEO Warren Buffett attends the Allen & Co Media Conference in Sun Valley, IdahoBy using Jonathan Stempel and Jennifer Ablan (Reuters) – Warren Buffett may be on safari for main acquisitions, which he likes to name elephants, but shareholders may just wonder if his Berkshire Hathaway Inc has change into the largest elephant within the room. Berkshire has grown to seem more and more like corporate The us, as Buffett expands outside its core insurance coverage industry into such areas as energy, industrial merchandise, newspapers, and in February ketchup, when he teamed up with Brazil's 3G Capital investment agency to buy H.J. Heinz Co for $23.2 billion. …