An election in which delegates select and nominate candidates is called a caucus.
No, he was one of the candidates for the presidency during the 2012 election, and he won. There is no election in 2013.
In a primary election, voters choose candidates who will represent their political party in the general election.
This depends on the election, but generally, there are only a few serious candidates every election.
primary election
These are elections in which candidates are not identified by party labels.
John Adams and Thomas Jefferson were the candidates in the first contested presidential election.
Third-party candidates are better of under the proportional representation of election.
An election held to choose candidates for the main election is called a Primary Election.
Primary
General election
no limit