I stopped believing that with the passage of time. My sense of corruption in government increased through the Clinton years, took a kind of semi-pause during the GWB years, and really accelerated once the Obama/Biden crowd came in (and the Clinton Foundation antics became apparent).
Now, I'd say our government is as corrupt as that of most other countries, on average.
After reading about Old Bought & Sold Joe Biden and his crooked family dealings with the University of Delaware mob, one cant help but see that nest of vipers as being a lot like the Mafia. It also looks like Nancy Pelosis corrupt family ties to the Mafia in Baltimore through her fathers mayoralty. Corruption festers on both our coasts now.