[Rails] Collect users who posted items with ActsasTaggable on Tag in rails 3

I am using Rails 3 and Acts as taggable on in my application.

I am fetching the articles associated with the tag by

Article.tagged_with("tagname")

and

Blog.tagged_with("tagname")

Now i would like to collect all the users from the above i.e.., people
who are all posted articles and blogs with this tag Please suggest me..

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