Source : Webster's Revised Unabridged Dictionary (1913)

Suffragist \Suf"fra*gist\, n.
   1. One who possesses or exercises the political right of
      suffrage; a voter.

   2. One who has certain opinions or desires about the
      political right of suffrage; as, a woman suffragist.

Source : WordNet®

suffragist
     n : an advocate of the extension of voting rights (especially to
         women)