The U.S. government is under great scrutiny at all times. This scrutiny tends to call in question it's perceived corruption. The U.S. government is corrupted as it has been proven time and time again by studies and "talkers", in the political spectrum that reveal that the U.S. government is indeed corrupt.
The U.S. government has been corrupted for years. With the growth of the state comes the growth of state contracts, which can be awarded for any reason. The more financial incentive there is to be close to government officials, the deeper the corruption will be. Recent administrations have been less transparent and prone to corruption.
According to a recent policy which i can't remember, political parties can now accept "donations" or superPAC's to support them being elected. Now you don't need a superPAC's to run for government but from a recent trend we can see that those who receive the most, often win. Now this means that it's the donors who control who get elected, but not any donors, the billionaires. AKA CEOs of power companies, manufacturers and large profit-based organisations. They can choose the party that will do what they want, and make them win. Why do you think that the U.S. government doesn't see climate change as a problem? Because they are funded by companies that rely on fossil fuels. This will get worse and worse, unless, Bernie Sanders is elected. It seems this is the only way for the lower class to ever have a chance at having a voice.