Wisconsin Statutes 6.76 (Electronic reproduction of 2009−10 Wis. Stats. database, current through 2011 Wis. Act 286).
6.76(1)(1) Any person entitled to vote at an election is entitled to be absent from work while the polls are open for a period not to exceed 3 successive hours to vote. The elector shall notify the affected employer before election day of the intended absence. The employer may designate the time of day for the absence.
6.76(2)(2) No penalty, other than a deduction for time lost, may be imposed upon an elector by his or her employer by reason of the absence authorized by this section.
6.76(3)(3) This section applies to all employers including the state and all political subdivisions of the state and their employees, but does not affect the employees' right to holidays existing on June 28, 1945, or established after that date.
6.76 History: 1977 c. 394; 1991 a. 316.
Statutes do change sometimes through amendments or repeal, so before relying on this language, it is always recommended that you check the status of the statute. You can see the current version and its history at http://docs.legis.wi.gov/statutes/statutes/6/III/76.