A Princeton couple has been charged with orchestrating a $5 million gas and oil company Ponzi scheme that defrauded friends across five states and using the money to pay for an elite school’s tuition, a tropical vacation and high-end shopping, authorities said. Ford Graham and his wife, Katherine Graham, are accused of operating the scam from January 2012 to January 2014, according to the Attorney General’s Office. The couple peddled unregistered securities to potential investors, claiming they were low-risk opportunities in gas and oil with returns of up to 20 percent, authorities said. Instead, they used investor money to repay...