Source : Webster's Revised Unabridged Dictionary (1913)

Demagogy \Dem"a*gog`y\, n. [Cf. F. d['e]magogie, Gr. dhmagwgi`a
   leadership of the people.]
   Demagogism.

Source : WordNet®

demagogy
     n : impassioned appeals to the prejudices and emotions of the
         populace [syn: {demagoguery}]