The tweet below, (complete with a picture of the truck, THANKS RORY!) was sent by Rory Appleton, a political reporter for the Fresno Bee, the most-read newspaper in both Nunes' and Costa's districts, respectively CA-22 and CA-16. Both members are extremely conservative, though Nunes is a Republican and Costa is a mangy Blue Dog Democrat.
Blue America's specific reason for the mobile billboard-- written by Digby, designed by Bill Mahaney-- was to draw attention to the two of them voting to continue U.S.-supported bombing in Yemen.