Sentence:  `` Now that Bruno Walter is virtually in retirement and my dear friend Dimitri Mitropoulos is no longer with us , I <WSD>am</WSD> probably the only one - with the possible exception of Leonard Bernstein - who has this special affinity for and champions the works of Bruckner and Mahler '' . 
Meaning of the word marked with <WSD> tags:  be identical to; be someone or something