Yes, the most voted answer floats to the top. But somehow the green mark is indirectly telling the (specially casual, unregistered) reader something like "this one is better".
I think it would be good to have another mark, say in blue, adding to the most voted answer that sort of "visual quality mark" that the green mark adds to the elected answer. You all know that it is not uncommon that the best answer (from the point of view of the reliability and correctness of the contents) is not the one that the OP elected, but the most voted. The fact that the most voted answer appears on top of the list merely enhances its visibility, but somehow I feel that this not "validating" enough.
I am talking about something like:
Perhaps the green text would better be "Accepted by the OP". But that is more or less the idea.
Eventually this is equivalent to a system of badges (though quite simple) for the answers, with different colors: accepted, most voted, and perhaps: more than X votes, etc.