Source : Webster's Revised Unabridged Dictionary (1913)

Utopianism \U*to"pi*an*ism\, n.
   The ideas, views, aims, etc., of a Utopian; impracticable
   schemes of human perfection; optimism.

Source : WordNet®

Utopianism
     n : the political orientation of a utopian who believes in
         impossibly idealistic schemes social perfection