Sentence:  What Sam Rayburn 's life proves to us all is the magnificent lesson in political science that one can devotedly and with absolute dedication represent the seemingly provincial interests of one 's own community , one 's own district , one 's own State , and by that <WSD>help</WSD> himself represent even better the sweep and scope of the problems of this the greatest nation of all time . 
Meaning of the word marked with <WSD> tags:  give help or assistance; be of service