It is true that political power is in the voting booth, but it is shared with the local political parties. How well both function depends on participation.
Every two years precinct people are elected, male and female, for each precinct and each party in a county. These precinct people are the central committee of their county party. The central committee elects officers and adopts rules and a platform. Two state committee persons are elected, male and female, to serve in the state central committee. The state platform, a compilation of local platforms, become the foundation for the candidates that decide to run. In some cases it becomes their strict marching orders.