CMS with Voting System

[Patrickssj6]

I am looking for a CMS that has similar functions like this one.
http://wormsreloaded.uservoice.com/forums/95917-general

I want people to be able to post and other people to vote on those posts. Does anyone know if such a CMS exist or how hard it is to modify e.g. WordPress to do this task?

[Kornman00]

IP.Content supports it, gamedev.net (http://www.gamedev.net/) uses it.

[jcap]

Like Pligg (http://pligg.com/)?

[paladin]

Google Moderator (https://www.google.com/moderator/) of course!

[Patrickssj6]

Like Pligg (http://pligg.com/)?
Yeah I took a look at them but now I decided to just learn PHP and go indept with the WordPress API :v: