One of the fascinating things about that article I linked to is that it shows that this extreme bias has only existed since the 1990's. Before that time academia was moderately slanted to the left (a ratio of 2-1 or 3-1), but not to the severe extent. It's important to note that while conservative positions on some issues are objectively at odds with science (global warming comes to mind), there are plenty of liberal viewpoints that are also at odds with mainstream scientific research (think research in genetically modified organisms, or mandatory vaccination policies).

This article is a good example of how liberal viewpoints can also conflict with science:

http://nymag.com/scienceofus/2015/12/when-liberals-attack-so...