Amid all the doomsaying on the economy lately, a graph in the paper that runs Turd Blossom columns as its funny pages was rather revealing: Americans are cutting back on poultry, beef, cereals, sugar, pet food and alcoholic beverages but spending more on eggs, fresh vegetables and fresh milk and cream. No wonder the catapulters of Spam propaganda have had no success boosting that scary product. Shoppers are skipping Alpo and flipping omelets.