And what service would that be?

Former Rep. Duke Cunningham wrote a letter urging the Homeland Security Department to use the limo service now known for providing hookers to Cunningham and his pals. Homeland Security tried to deny it, but they have now produced the letter. You can find it and the story here at TPMmucker. Josh Marshall definitely picked out the best line:

My favorite line from Duke's testimonial: Shirlington CEO Chris Baker "has been of service to me and other Members of Congress over the years."