WASHINGTON - Nancy Sinatra may wear boots made for walking, but she rode to the White House yesterday on the back of a motorcycle. The daughter of Frank Sinatra was part of a delegation of Rolling Thunder officials and others who met President Bush near the South Portico of the White House. Nancy Sinatra, who recorded "These Boots Were Made For Walking" in 1966, rode in wearing a knee-high skirt, dark shades and black cowboy boots. Rolling Thunder President Artie Muller was at the handlebars. Rolling Thunder, which provides information about Americans missing in action in the Vietnam War and...