http://journals.cambridge.org/action/displayAbstract?fromPag...
http://journals.cambridge.org/action/displayAbstract?fromPag...
When there's a dictatorship, no one is surprised when the dictator is bribed. In a democracy, you can't just walk into the president's office and drop a bag of money on his desk, but you can lobby the shit out of him.
Either way, you get to bribe someone who's in a position to hand out favours. That's just how political power works.
Note: I don't think that all lobbying is unethical or contrary to public opinion. I do think that a good majority of it is untested and inorganic. It's monied interests preserving monied interests.
If achieving policy based on majority opinions was actually the end game of lobbyists, why would they need to exist in the first place? Majority opinions would elect majority abiding politicians who would enact majority policies. Where's the step that necessitates lobbyists?
[1] http://www.sourcewatch.org/index.php?title=Gramm-Leach-Blile...