A voting system or electoral system is a method by which voters

Voting

Voting is a method for a group such as a meeting or an electorate to make a decision or express an opinion—often following discussions, debates, or election campaigns. It is often found in democracies and republics.- Reasons for voting :...

 make a choice between options, often in an election or on a policy referendum

Referendum

A referendum is a direct vote in which an entire electorate is asked to either accept or reject a particular proposal. This may result in the adoption of a new constitution, a constitutional amendment, a law, the recall of an elected official or simply a specific government policy. It is a form of...

.

A voting system contains rules for valid voting, and how votes are counted and aggregated to yield a final result.
Since voting involves counting, it is algorithm

Algorithm

In mathematics and computer science, an algorithm is an effective method expressed as a finite list of well-defined instructions for calculating a function. Algorithms are used for calculation, data processing, and automated reasoning...

ic in nature, and, since it involves polling the sentiments of a person, this represents affective data.