The purpose of a campaign is to get an official elected or

The main purpose of a political campaign is either to get an issue passed or a candidate elected.

The political campaign is used to get the support of the people who agree with the party to secure a political position. The message delivered during the campaign consists of informing people about the policy issues and it aims to leave a lasting impression on the voters. In the context of the USA it refers to the electoral campaigns in which the representatives are chosen and the referendums are decided. In present times the campaigns focus on the general elections and the candidate's for the president or prime minister.