Could you advertise in the precincts that went 100% for Obama asking if anyone voted for Romney to come forward?
Fraud was so massive, voiding the few votes in counties where votes exceeded registered voters won’t change the results hardly anywhere.
I lived 37 years in Chicago. We had democrats voting multiple times, dead people voting, blank ballots filled in by democrat operatives by the thousands, etc.
What you must understand is once any fraudulent ballot is deposited in a ballot box or an electronic machine, there is no ID on the ballot. We have secret elections which means ballots have no ID to trace the voter.
To stop fraud, the process must begin BEFORE voting. It will require a national ID confirming proof of citizenship. It will require voting in person. It will require validation of absentee ballots.
Re-counts are mostly pissing in the wind, and meaningful only in extremely close elections, within 0.1% such as was the case in Florida 12 years ago.