You are in denial. http://www.oolah.net/dir/Liberal
Salon is a very credible, leading, liberal-oriented organization - so what if they're liberal-oriented? That has nothing to do with their credibility. You are wrong to say otherwise.
The strong correlation of right-wing websites to have very low standards is its own issue, unrelated to whether they're right, 'center', left' or whatever.
Salon, for example, has broken major stories, such as co-breaking the Abu Ghraib photos.
It so happens they have attacked the left and praised the right on many occassionas, when the situation justifies it; right-wingers have posted Salon's criticisms of Obama in the past.