Right:
http://www.realclearpolitics.com/
Left:
http://politicalwire.com/
Also, politico.com has perspectives from both sides. I think the nature of blogs is that they're pretty biased--you just have to be willing to look for confirmation of things from multiple sources before believing them, because often things posted on political blogs (from both sides) are complete B.S.
One easy thing to do is to go to factcheck.org or politifact.com, two nonpartisan factcheckers that do a very good, evenhanded job.