Duplicated content - how to tell Google I am original author

Let's say I prepared an article I wish to publish on my not so popular blog. But I am afraid that this article is so good that much more popular site will steal it and publish it on its own. I am guessing that because of low popularity of my blog, the Google would show links to the bad site instead of my own. Is there a way to prevent such outcome? What if I would prepare an article, publish it on my blog and later decide it it so good that I'll put it on Wikipedia, is there a way that Google would consider me above Wikipedia?