Two types of political surveys: pre-election and voting intentions

In the pre-election survey is usually evaluated trends, opinions and attitudes related to the assessment of both policies and actions of government and with certain people.
In the first case, the pre-election survey can evaluate public policies, or the possible impact on public reform or specific action.
In the second pre-election survey seeks to know where certain personalities are known and candidates.
In contrast, pre-election survey seeks eminenemente know if people would vote, not vote or do not yet know, a particular candidate.
It is characteristic of pre-election poll people to try to know as a candidate associated with certain characteristics, such as being honest, experienced, tough, and many others.
This will seek to strengthen their candidate maintainers public properties by adjusting their speech and behavior in the campaign to the wishes of the electorate.
Sometimes the voting intention poll is combined with a simulation of voting in a ballot box is delivered to the respondent or with different ballots to choose one and "vote".