To the degree great inequality leads to this being decisive in elections, it is a corrupting influence, but the term for it is still not “bribery”.
But when a presidential candidate tells oil companies they should donate because he is going to help them, that’s solid bribery.
When companies pay to “settle” ridiculous accusations, or “donate” to a president’s causes, while their mergers or other business legal issues depend on an openly pay-for-play president’s goodwill, that’s solid bribery.
The country’s policies, discipline, reputation and competence (economic, diplomatic and political) are being sold off for a tiny fraction of what their future adjusted value is worth.
Say, a single donor can contribute a maximum of €6,000 per parliament candidate per election.
Yes, that's a real limit.
It's so broken.
Ideally they "shouldn't". But in practice they do.
Because the Supreme Court determined that money is free speech, its use in elections cannot be limited in general.
And where coordination between purportedly independent groups isn't supposed to happen, there is a strong "don't ask, don't tell" code, and a mountain of lawyers ready to scream "political oppression!" on the dime of the rich.