From the article........
Cunningham has admitted using his seat on the powerful House of Representatives Appropriations Committee and its Subcommittee on Defense to accomplish what the government said were contract awards that were "not in the best interests of the country."
You might want to rethink your characterization of his crimes.
Bribery is objective. "Not in the best interest of the country" is what many congressmen do every day. Some legal abuses of power are worse than some illegal ones. Cunningham deserves punishment, but I don't think he's the worst. The main reason to punish people with prison sentences for political corruption is to keep them out of political circulation. Cunningham is out of circulation anyway.