Endorsements
Whoever you decide to endorse with your vote its worth bearing in mind that by voting you are endorsing that person.
Reference from wikipedia
Political endorsement is the action of publicly declaring one's personal or group's support of a candidate for elected office.
In the case of a 4 or 5 party system, where one of the parties has a 15 to 20% predicted electoral support, just prior to the election, the official representative of the 5th party may give an official endorsement for a party that is more likely to be a contender.