Grover Bradfoot resigned as Attorney General on November 12, 1948 after being appointed to the Wisconsin Supreme Court. Thomas Fairchild, having won the election for the full term beginning in January 1949, was appointed to the fill the vacancy for the unexpired term.
Source for Popular Vote data: Wisconsin Board of State Canvassers, "Attorney General," Statement of Board of State Canvassers for State Officers General Election - 1948 (Madison, 1948)