The Collaborative International Dictionary of English v.0.48:

Liberalistic \Lib`er*al*is"tic\ (-[i^]s"t[i^]k), a.
   Pertaining to, or characterized by, liberalism; as,
   liberalistic opinions.
   [1913 Webster]

WordNet (r) 3.0 (2006):

liberalistic
    adj 1: having or demonstrating belief in the essential goodness
           of man and the autonomy of the individual; favoring civil
           and political liberties, government by law with the
           consent of the governed, and protection from arbitrary
           authority