...And Enron, and Goldman, and all of the companies that tanked us in 2008. Right? Where is this right spelled out exactly, except in the fiction that corporations are people without the responsibilities?
Whether you believe in the Citizen's United decision or not, companies are still groups of people. People, alone or in groups, have the right to speak, and to petition the government.
For clarity, I think this particular attempt at lobbying is terrible and they ought to be blasted for it publicly. That doesn't mean it should be illegal for a group of people to talk to the government about their interests, just that if those interests are counter to the interests of the general public then we should judge that accordingly.
Lobbying is speech. You can't just censor people you disagree with. That's not the basis of our democratic society. The price of being able to speak what you think is good, is having to hear what you think is bad.
I think OP is moving the goalposts here. They also say "It's wrong when our elected officials bend to those business interest when it goes against the public interest", which is clearly a moral argument as opposed to a legal one.
Then is your position that businesses should not be expected to behave ethically, but politicians should? That's a pretty weird line to draw. There's no reason we shouldn't expect all members of society to adhere to a generally agreed-upon code of ethics, even if parts of that code shouldn't be made into law.
In a perfect society, everyone would act ethically. That isn't true sadly. We have to often force people to be ethical. We force businesses into ethics through law. We can't guilt trip a business. We can however expect ethics/morality from politicians because they are people. And really, they are elected into their positions because of their ethics.
That would be the aforementioned fiction I was expecting you'd trot out. You really are just abandoning anything like a moral or intellectual dimension of responsibility in favor of pure legalism, up to and including IG Farben in Nazi Germany?!