In interview with David Letterman for Friday’s “Late Show,” ’12 high flier blames the Beltway for sexual harassment flap.

Cain: “In my entire career, no accusations were ever made of that sort, not until I got inside the Beltway in Washington, D.C… The reason that I went front and center in front of the media is because I knew that there wasn’t anything to it.”

Watch the video above.