In 1968, former Congressman George Herbert Walker Bush of Texas, fresh from voting to send other men's sons to Vietnam, enlisted his own son in a very special affirmative action program, the 'champagne' unit of the Texas Air National Guard. There, Top Gun fighter pilot George Dubya was assigned the dangerous job of protecting Houston from Vietcong air attack. This week, former Lt. Governor Ben Barnes of Texas 'fessed up to pulling the strings to keep Little George out of the jungle. "I got a young man named George W. Bush into the Texas Air Guard - and I'm ashamed." THE PAY-OFF That's far from the end of the story. In 1994, George W. Bush was elected governor of Texas by a whisker. By that time, Barnes had left office to become a big time corporate lobbyist. To an influence peddler like Barnes, having damning information on a sitting governor is worth its weight in gold or, more precisely, there's a value in keeping the info secret.