Political parties aren’t mentioned in the U.S. Constitution. Political parties developed in the first years of the republic, however, and soon drove elections. Only recently have the party candidates been chosen largely by primary voting.
Traditionally, the choice of a party’s candidate wasn’t certain until the party convention itself. Deals were made in those smoke-filled back rooms. Not until after the 1960’s did the convention become a boring pep rally that merely rubber stamped primary elections.
The earlier method sounds undemocratic. However, some are calling for a return of true political conventions, where the delegates are not pledged to any candidate. Decisions are made at the convention.
A return to the earlier system means the political party leaders consider more than the wishes of their base voters. They take the longer view, considering how likely a candidate is to be chosen by the larger electorate. They search for a candidate who appeals to the independents and perhaps a few of the other party who might consider voting for an especially qualified candidate.
Listening to the anger-filled, even violent emotions of the current campaign, the return to those backrooms is appealing.