Something strange seems to have happened.
Up until yesterday I was the proud owner of the 'Vox Populi' badge. But this morning when I logged in to StackOverflow I noticed my number of badges was one less. It turned out that it was my 'Vox Populi' badge that was missing. How could this have happened? Does it have to do with questions being deleted? That would seem strange to me, since this badge should reflect my actions (marking me as an active voter) and should be independent of the actual questions/answers I voted on.