How about Iowa Senator Chuck Grassley. @gamepwn did a post a while back about how he helped expose that huge Pentagon child porn ring back in 2011. He's got a long history of being a friend of PG. From his Wikipedia bio:

In February 2004, Grassley released an internal report composed by the FBI in 2000 that examined 107 instances of either serious or criminal misconduct by its agents over a 16-year period. In a letter to the FBI, Grassley called the report "a laundry list of horrors with examples of agents who committed rape, sexual crimes against children, other sexual deviance and misconduct, attempted murder of a spouse, and narcotics violations, among many others" and added that the report's findings raised questions about whether the FBI handled agents "soon enough and rigorously enough".[24]

On June 28, 2006, Grassley proposed legislation[25][26] intended to curb sex trafficking and sex slavery in the United States by means of strict enforcement of tax laws, for example by requiring a W-2 form be filed for each prostitute managed by a pimp or other employer.

Also relevant:

The author of the Whistleblower Protection Act of 1989, Grassley has campaigned to increase protection and provide support for "whistleblowers". He has supported a number of FBI whistleblowers, including Coleen Rowley, Sibel Edmonds, and Jane Turner, although not supporting Department of Defense whistleblower Noel Koch.[76]

Grassley received a lifetime achievement award on May 17, 2007 from the National Whistleblower Center. In April 2014, Grassley announced plans to create a caucus in the Senate dedicated to strengthening whistleblower protections.[77][78]