Source : Webster's Revised Unabridged Dictionary (1913)

Endorser \En*dors"er\, n.
   Same as {Indorser}.

Source : WordNet®

endorser
     n 1: someone who expresses strong approval [syn: {subscriber}, {indorser},
           {ratifier}]
     2: a person who transfers his ownership interest in something
        by signing a check or negotiable security [syn: {indorser}]