None of the amendments were technically necessary because the preamble to the Bill of Rights said they clarified the Constitution and didn't alter it. We still have the right to bear arms whether or not it says so.
Or the deal was made and merely disguised as failure.
>THE SECRET DEAL: Sometimes the only way to strike a deal is to do it without anyone knowing
http://stateofthenation2012.com/?p=117725
You'll never find a 4-leaf shamrock, but you can find clovers with 8 or 9 leaves.