Digg is one place this is starting to happen. Here is a list of prominent stories where conservatives have been able to bury many far-left comments.
It's true that story voting is much more important than comment voting, but comment voting is the only objective metric we have for knowing when the tipping point happens, when conservatives are able to get majority control.
How are conservatives able to find the lower-scoring stories that liberals haven't noticed?
The #DiggCons twitter stream is one way (DiggCons.newsplaton.coom hosts a version with anti-spam features).
Another way to find these stories is to follow other prolific conservative users: