(1)    There shall be 71 district attorneys elected for full terms at the general election held in 2008 and quadrennially thereafter. The regular term of office for each district attorney is 4 years, commencing on the first Monday of January next succeeding his or her election. Each county is a prosecutorial unit and shall elect a district attorney, except that Shawano and Menominee counties form one 2-county prosecutorial unit and shall elect a single district attorney by the combined electorate of the 2 counties.

   (2)   

      (a)    Except as provided in par. (b), each district attorney serves on a full-time basis.

      (b)    A district attorney serves on a part-time basis if his or her prosecutorial unit consists of Buffalo, Florence, or Pepin county.