I don't think they do. However, once you publish the contest, you can change the date of your contest to keep it at the top. That is how a lot of bloggers do it.
Here's something that may help you out. This is where I learned: http://abookbloggersdiary.blogspot.com/2008/07/how-to-make-sticky-post.htmlYou could also add a widget above your post that says "Make sure you check out my giveaways below." You can check out my site and see what I am talking about with this.
I would change the date each time you post to keep the contest on top. I'm sure though that you can find something else to keep it on top. I don't use blogger so I'm not familiar with themHave fun!
If you just set the date to a future date, it will stay on top.
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