The former Alaska governor joined about 400,000 bikers for the annual ride, which coincided with the first leg of a bus tour that is renewing speculation about her 2012 White House ambitions.
Palin, who had no official speaking role at the event, arrived wearing a helmet and rode on the back of a Harley from the Pentagon toward the Vietnam War Memorial. Rolling Thunder, which began in 1988, was established by Vietnam veterans to draw attention to missing service members and prisoners of war. Palin’s husband, Todd, and daughters Piper and Bristol also took part in the ride.
