The NRCC is going up on the offensive in several congressional districts trying to tie 'vulnerable' incumbents to Speaker Pelosi. According to the ad, as Pelosi claimed that the CIA lied to congress, "Pelosi's Crowd," of which Perriello is apparently one, voted to protect Pelosi. They are setting out radio ads in six districts, including Perriello's, and are doing robocalls in 11 other districts.
As Pelosi conjures immediate visceral disgust among Republicans, this ad attempts to create a classically conditioned guilt-by-association response. Simply put, the ad is a partisan hit piece - naturally, it's the NRCC - evidenced by the fact that they targeted only 'vulnerable' Democrats.