In the end, the fault lies with the structure of the democratic process itself. The system of party delegates who then choose the presidential nominee from each political party, the first past the post electoral system by state (instead of a nationwide popular vote system)... These are all ways to effectively make elections in the US less democratic. Looking back at the founding fathers and which social and economic class they represented, the conclusion is that this supposedly flawed democratic system was implemented by design, allowing them to put a hand on the scales and tip the balance of power in their favour. Compare this electoral system with the representative democracy of western European countries for example, and you'll see some differences.