http://www.advancementproject.org/pdfs/alerts/PoliticsofVoterFraud.pdfkey findings
• Voter fraud is the “intentional corruption of the electoral process by the voter.” This definition covers knowingly and willingly giving false information to establish voter eligibility, and knowingly and willingly voting illegally or participating in a conspiracy to encourage illegal voting by others. All other forms of corruption of the electoral process and corruption committed by elected or election officials, candidates, party organizations, advocacy groups or campaign workers fall under the wider definition of election fraud.
• Voter fraud is extremely rare. At the federal level, records show that only 24 people were convicted of or pleaded guilty to illegal voting between 2002 and 2005, an average of eight people a year. The available state-level evidence of voter fraud, culled from interviews, reviews of newspaper coverage and court proceedings, while not definitive, is also negligible.
• The lack of evidence of voter fraud is not because of a failure to codify it. It is not as if the states have failed to detail the ways voters could corrupt elections. There are hundreds of examples drawn from state election codes and constitutions that illustrate the precision with which the states have criminalized voter and election fraud. If we use the same standards for judging voter fraud crime rates as we do for other crimes, we must conclude that the lack of evidence of arrests, indictments or convictions for any of the practices defined as voter fraud means very little fraud is being committed.
• Most voter fraud allegations turn out to be something other than fraud. A review of news stories over a recent two year period found that reports of voter fraud were most often limited to local races and individual acts and fell into three categories: unsubstantiated or false claims by the loser of a close race, mischief and administrative or voter error.