High profile officials at the National Republican Senatorial Committee knew about Sen. John Ensign’s, R-NV, affair back in 2008. Ensign was head of the committee when his mistress’ son worked there. Rachel Maddow is joined by Las Vegas Sun columnist Jon Ralston.

This video is from MSNBC's The Rachel Maddow Show, broadcast Aug. 3, 2009.

Download video via RawReplay.com