The Collaborative International Dictionary of English v.0.48:

Limousine liberal \Li`mou*sine" lib`er*al\, n.
   a wealthy or well-to-do person of liberal political
   inclination. It is sometimes used as a term of contempt for
   those espousing the cause of poor people, without having to
   endure the discomfort that their policies may inflict on
   others, such as the lower middle class.
   [PJC]