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National Convention
This is called a political convention.
Political parties select their candidates for president after the primary elections. They go to their parties convention and cast votes for the person they think has a better chance to be elected.
citizens vote for delegates in primaries and caucuses and delegates then select the candidate at a national nominating convention
The purpose of the national convention system is to bring together delegates from each state to nominate a candidate for the presidency of the United States. It serves as a platform for party members to discuss and determine the party's platform and select its presidential and vice-presidential nominees.
To select delegates to the county convention, which in turn selects delegates to the state convention.
No, in a democracy the president doesn't normally select the next president.
the electoral college works like this the convention delegates settled on a system in which each state legislature would choose a number of electors. The electoral college would select the president and vice president.
The VP candidate is chosen by a vote of the delegates after they choose the presidential candidates. In recent years the presidential nominee has told the convention whom he wants and the convention has acceded to his choice. However this was not always the case and may not be the case in future.
When James Garfield was assassinated, his vice president, Chester A. Arthur, became president. Arthur did not select a vice president when he took office in 1881, and seems to have completed Garfield's term without a vice president to assist him.
Non-binding primaries is when states can select candidates to a specific state convention and then select delegates for the national convention. Binding primaries is when all of the delegates must vote for a candidate at the national convention.
The president nominates a new candidate who must then be approved by congress. It's essentially the same process that's used to select cabinet members.