DALLAS -- Former Texas State Board of Education member Geraldine "Tincy" Miller defeated Gail Spurlock on Tuesday for the Republican nomination for District 12.Miller will face Democrat Lois Parrott in the November general election for the district that includes North Texas' Collin County and part of Dallas County.Miller, ousted in the primary two years ago after 26 years on the board, is vice chairman of a Dallas commercial real estate company.Spurlock had said she would have voted "the vast majority of the time" with the board's social conservative bloc. Miller has said she'll vote her "conscience" and "conservative beliefs."Following redistricting, all 15 spots are up for re-election on the board that establishes the state's public school curriculum, approves textbooks and manages the state's permanent school fund.In other education board runoffs, Rebecca Osborne was leading Tom Maynard in late returns Tuesday night for the Republican nomination for Central Texas' District 10 spot, and Ruben Cortez Jr. was leading Celeste Zepeda Sanchez for the Democratic nomination in South Texas' District 2.Other down-ballot statewide races being decided Tuesday were two Republican races for the Texas Railroad Commission, one involving the chairman, and a primary challenge against a Republican judge on the Texas Supreme Court.The State Board of Education has drawn attention in recent years for its battles over teaching evolution and attempts to elevate conservative figures in history lessons. Currently, there are four Democrats and 11 Republicans on the board, with six Republicans considered part of a social conservative voting bloc. The May primary had no major effect on the makeup of the board, which establishes the public school curriculum, approves textbooks and manages the state's permanent school fund.Cortez, a Brownsville businessman, says on his website that he advocates keeping politics out of the classroom. The winner faces Republican Laurie Turner in November.