In my opinion, the only one that really hit the nail on the head.stormbind said:The ratio is similar in real life too.
There are simply more liberals than there are conservatives.
The reason things seem a lot more balanced than they really are is that a higher percentage of conservative-minded people vote than liberal-minded people. If every single liberal and every single conservative consistently turned out on election day, liberals would win everything every single time. On the internet, it's not much trouble to spout ideas, so even if a person won't really make the effort to go out and vote, they'll still identify themselves online with their chosen political view.