GREENSBORO, N.C. (AP) — A federal judge refused Sunday to help in attempts to open early voting sites at three public North Carolina universities, declining requests to overrule decisions by Republican-controlled elections boards leading up to the state’s upcoming primary. U.S. District Judge William Osteen rejected arguments by the College Democrats of North Carolina and some students that they were likely to win a recent lawsuit because decisions by GOP board members placed undue burdens on