strategic voting

As per Wikipedia, strategic voting occurs when a voter misrepresents his or her sincere preferences in order to gain a more favorable outcome.

According to Gregory D. Morrow et al., strategic voting, is only valid if the following conditions are met:

1. It must be a close 2-way race (i.e. the two other parties must be within 5%)
2. The chances of your party winning riding are remote (i.e. support < 25%)
3. Small number of votes will make a difference (i.e. < 1 in 3 voters).

If you wish to find out whether, your riding matters under these conditions visit this link. You might wish to locate your riding or to review the latest opinion poll.