By using the caucas, the people took no part in the process

By using the caucus, the people took no part in the nomination process. Nomination is a part of the process (that selects a candidate for election to a public office).

Caucus refers to the system of electing delegates in two states in the primary/preliminary phase of elections, in which each party decides who will be the candidate of that party to the presidency. It is a gathering of party leaders to talk over possible candidates.