The rich and powerful are always going to try and skew government in their favour. The way to achieve this varies according to the type of government. If there's no democracy, you don't need to mind the people, you just need to get to the government. In a democracy, misleading the people is an option, and a good one at that,because unlike bribery it's 100% legal. A democracy is always going to attract those kinds of influences, and part of living in a democracy means keeping your eyes open for them to prevent public opinion from being hijacked. Most democracies exist only because of the dogmatic idea that you must be democratic because it's the right thing, period. And in those democracies public opinion tends to be weak and malleable, because that dogmatic idea leads to believing that democracy will sort itself out, which it rarely does. Switzerland is the prime example of a democracy that figured itself out, and where consequently public opinion is wary of those influences.
Sorry if this shatters your naive and utopic perception of democracy. By no means am I against democracy, I'm just realistic about the double edged sword that it is.