Dear Customer (name blocked for privacy):
One can always sue. The question is, will you win? I don't think you'll win this one.
You may, however, want to talk with the hiring manager with whom you spoke in private and let him or her know that you have reason to believe that he or she shared privated information with the successful candidate, and that you are disappointed that he or she did not keep your comments private. Leave it at that.
Good luck,
Merry
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