And then there is representative government, within a party system, to add to the complexity of a democracy.

You elect a person under a party banner to represent you. But, to retain any status within that party, this person most often is required to "toe the party line", wherether or not his actions represent what he knows to be those who elected him. Often, lobby interests are more important to the party, for financial reasons, than the folks who voted them in to represent their interests.