Liberal democrats are pro Europe

I've tended to link liberty with being liberal, but now I see this is not so.  So I have no idea what being liberal means now.

http://www.telegraph.co.uk/news/politics/9766846/Nick-Clegg-warns-David-Cameron-not-to-back-out-of-Europe.html

http://www.guardian.co.uk/politics/2012/dec/26/clegg-warning-cameron-britain-europe