We can pay attention. We can stop being led around like sheep, and start educating ourselves on the issues. We can read some of the bills before our legislature, and we can write our representatives to tell them how we feel. Even more importantly, we can make informed votes. Voting in and of it's self is not enough.
Corrupt politicians rely on uninformed voters for reelection.
They flood the airwaves with money, and drown out the issues. They win not on platforms, but on sheer name recognition. We have the power to end corruption simply by not buying it anymore. If we want to end corruption, we have to do it by not electing the corrupt. And if we can ever get honest people in office, then health care, education, and all the other little problems will get taken care of again.