A system and apparatus for marking a pre-printed paper ballot which can be either hand-marked by a voter, or machine-marked by the apparatus. If the ballot is to be machine marked, the ballot is inserted into the marking apparatus and candidate selections are presented to the voter on a touchscreen. Candidate selections entered on the touchscreen are marked on both the top and bottom sides of the ballot utilizing a dual print head to mark spaces corresponding to the selected candidates, and the ballot is returned to the voter in a form which enables the voter to visually confirm that his selections have been marked. The ballot, whether hand-marked or machine-marked, is inserted in a ballot scanning device, wherein it is tallied and deposited in a ballot box.