Senate Democrats say most of Illinois’ 860 public school districts would have their funding cut next year if the state’s temporary tax increase rolls back as scheduled.  Figures the Democrats are circulating detail a total of $450 million in general state aid cuts to schools and support Democratic arguments for extending a tax increase and changing the complicated school funding formula.  Democrats estimate Illinois will lose $1.6 billion in revenue if the state’s tax increase rolls back in January.  Still, some districts will actually see funding boosts despite because they will appear “poorer” through the eyes of the state.  Republicans say Democrats are needlessly seeking to expand spending once again.