MADISON (AP) - The officially nonpartisan race to be Wisconsin schools chief could be conservatives' best chance in years to defeat a Democratic-aligned state superintendent, one of the last statewide offices Republicans have been unable to control. Conservatives who back the expansion of private school voucher programs are eyeing this spring's state superintendent race as a chance to knock off incumbent Tony Evers, a school choice critic whose base of support has been Democrats, public school advocates and teachers unions. Evers will face school choice advocates John Humphries and Lowell Holtz on Feb. 21.