In Steem you can not only use your own Steem Power for voting, but other people may choose to 'delegate' extra Steem power for you to use. Around 1600 (usually high value) accounts choose to do this so that they can distribute their votes more easily, in effect they are delegating curation to others.
I've added a tool which shows the current delegation state of any account you enter. It shows who an account delegates to, and who delegates to it, and is updated on a daily basis.
@Ned recently delegated a large amount of Steem Power to some other users, and you can see his delegation above and here.
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