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So, tell me how it works..
Proxy voting?
You do realise, that you are voting for the guy above!
And no chance, that you could disapprove that vote.

Voting for the guy above, as in?

your witness vote goes to @roelandp

Yes, with my consent.
I like what he's doing, so I voted for him.
I've voted for bernie too. I like what he's doing as well.