I was recently answering some questions and came up with a pretty decent idea. What if when you know your correct answer is un-rightfully down-voted you request a moderator to reset your score to 0?
I assume most users at times have had submitted answered that they know are correct and have even tested to prove they are the correct answer but people still down-vote them. Possibly a few people that don't understand or have unsportsmanlike competitiveness down-vote you; then others just ride the crowd and leave you with -2,-3, or worse score for a correct answer. I know the -2 reputation is not a big deal but I assume most do not have negative scores in their answer history. So how about if someone gets like -2, -3, or lower for a vote; and if they absolutely know it is a working solution they can put a request for some high-rep user or moderator to evaluate their answer and if they agree it should not be negative they have the power to reset the answers score back to zero.