Pumpkins are big business in Illinois. A state lawmaker has a sweet idea for making sure people know it: he wants to make pumpkin pie the official state pie.  Republican state Representative Keith Sommer introduced legislation to make the designation last month, in time to honor the yearly pumpkin festival which just took place in his hometown of Morton, in the heart of Illinois pumpkin country.  “I recognize we have much more serious business to do as a state.  But in celebration of the festival, I thought it was appropriate,” Sommer told the Springfield bureau of Lee Enterprises newspapers.  Pumpkins are a $33 million industry for the state, the top producer in the country.  Morton, southeast of Peoria, is home to the Nestle USA Libby’s plant, which processes much of the canned pumpkin distributed in the U.S.  About 90 percent of the country’s canned pumpkin comes from surrounding Tazewell County and nine other Illinois counties.  Governor Pat Quinn issued a proclamation this month designating September 13^th as Pumpkin Pie Day in Illinois.  It was presented to officials at the festival in Morton last weekend.  Few foods are “more purely American than pumpkin pie,” Quinn said.  No other state has dibs on pumpkin pie as its official pie.  Sommer expects his bill to come up for debate next spring.