Sentence:  On September 16 , Sam Rayburn will have served as Speaker twice as long as any predecessor and I <WSD>am</WSD> proud to join with others in marking this date , and in expressing my esteem for that notable American , Sam Rayburn . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)