Ask HN: Duplicate post gets higher upvotes

"Firefox is back. It's time to give it a try"

This article had been posted 8 hrs back by two members within 1 hr of each other. The first post is by a member having 200+ points and the second duplicate post by a member having 5000+ points.

The second post is now at the top of the page with more than 745+ upvotes, while the original post has quietly died to page 3 of HN.

Is this just how things are or does higher karma have advantages in posting?