The budget that President Bush sent to Congress this week tops $2 trillion, and is already being criticized for being overly generous to to many constituencies, given the current state of the national economy. But public television stations nationwide are wondering where they can sign up for some of the president’s fiscal generosity, after discovering that the budget calls for the elimination of funds designed to ease the transition of such stations to digital broadcasting, as mandated by the FCC. Without the funding, many public stations in rural areas have claimed that they will be forced off the air.