Roger Lawrence Butler said this quote

On paper, the people now choose the party nominees for president. And yet, the process seems to have come full circle. [back to party bosses choosing] Voters theoretically get to pick the candidates, but in practice they rarely get the opportunity. In most cases, the contest is over in a few weeks after a burst of activity in a handful of states. How did the reform movement [late 60s, early 70s] get so far away from the plan? The answer is that there was no single plan, nor a single entity hat could craft a system to meet the original intent of the reformers. [To democratize the process]