About 25 years ago, there was an election in the next town over (Oakland Park), where if I recall in one low-turnout city election the officials results were that 4 people had voted for one particular candidate. So the candidate checked with friends and easily rounded up 6 or so conservative voters who swore out affidavits that they had voted for this one. But nothing came of it, since I believe the official answer boiled down to “Your friends could be lying to you.”
Just for grins, take a look by, county at the unofficial official reported election results.