As has been previously said - it's probably just as liberal as most other unis.
Cardiff is a 'liberal' stronghold (at least in council elections) because of the sheer number of students here who vote for them. It's a contest of the "centre-left" here and the Tories don't get a look in.
Though, we do have a Young Conservatives here, or Conservative Future or whatever the heck it goes by now...so it's a diverse mix.
I'm assuming you're bringing this up as you have an innate fear of Reds and Commies (both the same, I know) coming into your flat at night and duct-taping your mouth and throwing you to the wolves for having "rightist/slightly right of centre/centrist views".
Don't stop the make-up of students from letting you attend a Uni. Uni is a diverse mix of people, and there will always be a majority, a minority, and an overwhelming sense of politics going around.