Indeed. As a non-American, I find it quite absurd that corporations can "donate money" to change a Congressman's opinion on a law, and then support them in Congress when passing new bills. As far as I know that's what bribing is pretty much anywhere else. So US has in effect legalized bribing, and almost everyone in US seems to think that's "normal" and okay, and that there's "little corruption" in US, when in fact the whole government wreaks of "legalized" corruption.
Does that happen in other countries, too? Sure. Bribing is everywhere. But at least we see it for what it is, and even if we don't catch them in the act, there can be investigations later, and have them arrested. Good luck doing that in US - ever.