According to the [SuperUser FAQ][1] section on Reputation, once you reach 250 points of rep, you have the ability to vote to close, reopen or migrate your own question. That also means that you will be able to see other people's close votes as well. The functionality you're looking for already exists, you'll just need to earn some more rep before you can use it.


  [1]: http://superuser.com/faq#reputation