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Yep. Because the theory goes:

• This is a poor answer, I will give it a -1
• If they want to rid themselves of the -1's, then they should improve their answer with an edit
• If they edit it, everyone who has previously voted can re-cast their vote
• If they don't edit it, then the original reasoning for your vote still stands

See for more info:

• Request change in behaviour: Vote too old to be changed, unless post is edited
• Vote too old to be changed, unless post is edited