As Texas schools scrounge for cash to buy supplies and threaten to lay off teachers, $830 million in education funding earmarked for the state is sitting at the federal Department of Education, reports the Wall Street Journal. The money, part of the stimulus package passed last year by Congress to help U.S. schools, is trapped by an increasingly hostile battle between the state’s Republican and Democratic politicians over how to use it–to the dismay of school districts facing an almost $10 billion shortfall in state aid…