That would be a better method.
The problem is you'd have to hit all the candidates. It wouldn't be fair otherwise. And wouldn't it be embarrassing to indict all the candidates before an election? Wouldn't that be a bigger distortion?
I'm from Texas, vote buying is widespread, common and well known in some areas.
I'm from Chicago where vote buying is cheaper because the dead don't charge much :^)
I said it would be a better method, not the best.
I'm not a fan of stings in most cases anyway, but I would guess the act would have to be completed, indictment likely after the election.
I'm still voting for old fashioned investigation, interrogation, evidence gathering...
I would dearly love for vote fraud to be discovered and prosecuted severely; running a fake candidate is just not the way, IMHO.