Parties may run a closed list, with the order of candidates pre-determined, or opt for preferential voting (open list), where the position of candidates on the list is reordered based on the individual preference votes of the voters. In senatorial elections, voters choosing a party running a closed list only vote for the party list; voters who choose a party running an open list may indicate their candidate of preference among the names displayed on the ballot, if the voter does not indicate a preference and only votes for the party, the vote is valid for purposes of the threshold but not for reordering the list based on preferential votes.