I learned how to do bias evaluations of web sources in an ethics class. The site you listed is biased and is likely not an objective source for political opinion. It can be seen by an examination of the titles of books site listed in association with this site, predominately conservative, anti-abortion, anti-'political correctness', etc., publications:
http://www.encounterbooks.com/
Additionally, one of the two founders of this website has a list of his published editorials, all of which show a decided conservative slant:
http://www.realclearpolitics.com/Commentary/com-Tom_Bevan.html
The other author of this site, John McIntyre, lists his editorial publications too, which also contain themes biases toward conservative themes:
http://www.realclearpolitics.com/Commentary/com-John_McIntyre.html
The point is, if you want objective information to base your own decisions on, it's better to locate as close to unbiased sources as possible, otherwise you will get a slanted view, and the quality of your decisions will likely suffer. It's not that biased sources can't provide objective data, but that often they do not. That's the difference between objective sources and propaganda.