How to deal with answers exactly copied from other SO answers
I came upon a question yesterday that had been voted for close once, for reasons of being an exact duplicate (which, when following the auto-generated in-comment link, it very clearly was.) I voted to close as well. A couple minutes later, an answer was posted that I'm almost 100% certain was copy/pasted from the (well researched) accepted answer to the linked duplicate. The question was eventually closed, but the answer poster still received a few upvotes prior to that occurring.
Now, my questions:
Do you keep rep from questions that are closed? I know that if it is eventually deleted then a recalc will reclaim the rep, but what of closed but extant questions? (I would imagine that you would, since the fact it's not closed meant that it was deemed worth keeping the duplicate around.)
What is the current thinking on this kind of situation? On the one hand, I find it annoying that a clearly cribbed answer garners rep for the poster. On the other hand, maybe I should be blaming the upvoters, since they could just as easily not voted (or even downvoted.) I suppose voting is the community's way of making their opinion known, but I'm still curious to hear what others think about this topic.