In addition to the laws, all the political parties in India have to agree a model code of conduct for election campaign.
According to this, no party or candidate can
(i) use any place of worship for election propaganda
(ii) use government vehicles, air crafts and officials for elections.
(iii) minister shall not lay foundation stones of any project, take any big policy decision or make any promise of providing public facilities.
Thus, it can be concluded that both political party and candidate have to strictly follow the rules and the model code of conduct for election campaign.