MADISON, Wis. (AP) – The state board that oversees elections in Wisconsin is moving toward filling a vacancy.  Seven candidates are competing for the slot on the Government Accountability Board left by Judge Thomas Cane of Wausau. His six-year term ends May 1.        The board’s candidate committee is meeting Tuesday to nominate at least two candidates to Gov. Scott Walker for appointment. Whoever Walker selects must also be confirmed by the Republican-controlled Senate.  Cane will continue to serve on the board if the governor does not make an appointment by May 21.  The board is comprised of six former judges who serve staggered six-year terms. They oversee elections and enforce campaign finance and ethics laws in the state.