Legitimacy of election is one of the need for democratic and political rivalry. Until the people know the goals of the candidates and ask them for their commitments in the future.
Providing financial resources for candidate’s campaign is an important issue. In this part different countries have different guides of law.
For example, it was clear in presidential, provincial council and parliamentary elections guide of Afghanistan that which source they can use for campaign’s money. The candidates have to prove that the money he/she uses in the campaign is not coming from an illegal way.