Liberalism is the belief in the support of liberty equal rights. It is the enemy of Conservatism and irrationality, a friend to reason and humanism. It is about letting one pursue a life free from the constricting moral obligations of the accepted norm. It is about freedom, equality, and reason.
This pretty much sums it up: http://www.youtube.com/watch?v=WibmcsEGLKo&list=LL9tS89yE-YLkoNm8fzm6HgA&index=8&feature=plpp_video