I firmly believe that you need an editor for your blog. I've seen far too many blogs and publications – even otherwise large and professional organizations – with sub-par blogs. You would not believe the number of companies I've looked at with blogs that are low-quality, all over the place in tone and voice, with broken links, grammar errors, and even content that just never got indexed. As often as I discuss the necessity of having someone perform topic research and strategy, it's almost equally important to have all the technical writing and editing details down before then. Trust me, articles that haven't been edited will not perform as well as articles that a dedicated editor carefully edits.