California: Grace Napolitano

Grace Napolitano is a fairly unassuming back-bencher Congresswoman from the Los Angeles area, who generally votes well on most issues.  Being in a heavily Democratic district, she hasn't faced much competition from Republicans in election cycles during her decade in Congress, so she's had to find somewhere for campaign contributions to go.  Like her pocket:
During a decade in Congress, California Representative Grace Napolitano has pocketed more than $200,000 of political contributions by charging as much as 18 percent interest on money she loaned to her own campaign.

The suburban Los Angeles Democrat made the $150,000 loan in 1998, when she was first elected to the U.