Just because there is less reports of corruption in the past by dems doesn't change anything. Corruption extends beyond parties, its not a political problem. Its a human problem.
I don't expect to see much change when the dems come back into power, albeit, it be less apparent and of a different nature, I.E more indiscriminate surveillance and less racial profiling ..
There is some kind of cultural thing going on that transcends the party's IMHO that's keeping this problem going.