Originally Posted by nehadas87
It’s not just duplicate content that will affect where you rank it seems but Matt Cutts of Google’s Webspam team also wants to see you bring additional value. If you have the same content as another site just written differently Google will try to catch this and while based on other factors you might have ranked second to another similar page you could get knocked down off the first page.
The idea is that if you rank #1 in Google, it's because your page is actually the best result for that search term.
So you have to ask yourself if your page actually DESERVES that top position.
If it doesn't, then you've got some work to do