People who are trying to be elected to a particular official job are called

A candidate

Explanation:

to be elected to an office — in this case a candidate selection procedure occurs.

"Nomination" is part of the process of selecting a candidate for either election to an office by a political party, or the bestowing of an honor or award. This person is called a "nominee", though nominee often is used interchangeably with "candidate". A presumptive nominee is a person or organization believes that the nomination is inevitable or likely. The act of being a candidate in a race for either a party nomination or for electoral office is called a "candidacy". Presumptive candidate may be used to describe someone who is predicted to be a formal candidate.

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d) he bring down boss tweed and tammany hall.