The National Education Association, the largest education union, is preparing for a long, tough fight to re-elect President Obama. In an interview with POLITICO, the group’s executive director, John Wilson, said he’s prepared to invest resources and manpower to reelect Obama, despite disagreements with the administration on education policy. “We’ve got a lot of selling to do. Our members are very unhappy,” Wilson said. “We’ve got to explain to them the stakes. We cannot wait until a few months before the election.”