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The party platform written in every four years this was very common in US and like that politician platform also nominate for every four years president and vice president candidate are given to approval of it
A political party platform comprises a set of principles or rules, according to which is supported by a political party. These principles are meant to gain the public interest and their support for in the form of votes about complicated topics or issues.

Every four years, a national convention is held by the political parties in order to nominate a presidential and vice presidential candidate. They also conduct meetings in order to give an approval to a party platform of issues, including the positions upon which the representatives will run.