Voter fraud is the crime of a voter submitting a ballot he or she is not entitled to cast. Although it is hard to quantify the amount of voter fraud, it has been estimated at 2000 cases in the 2000, 2004, and 2008 elections combined. However, it is difficult to gauge the exact number, and many cases may go undiscovered or unreported  It can change the outcome of a close election.
Even areas not known for voter fraud have unexplained discrepancies between voter registration lists and estimates of the number of eligible voters. In Indiana, for example, one expert estimated that there were 1.3 million more names on the registration rolls than there were eligible voters in the state.[Citation Needed]
Types of voter fraud
Types of voter fraud include (in order of commonness)
|Type of fraud||Description||Number of cases since 2000 (source: )|
|Absentee ballot fraud||A voter fraudulently obtains and submits absentee ballots (in some cases those belonging to other voters).||491|
|Registration fraud||Fake names are submitted to be added to voter registration rolls.||400|
|Ineligibility fraud||An ineligible person (such as one under 18 or, in some states, a convicted felon) casts a ballot.||263|
|Double voting||One voter casts a ballot in two or more jurisdictions.||150|
|Impersonation fraud||One voter votes in the name of another voter.||10|
Voter ID laws are usually designed to only prevent impersonation fraud, although in some cases they may make it more difficult to commit ineligibility fraud or double voting.
ACORN -- organization involved in a controversy where false voter registration forms created by workers were forwarded by the organization to state election authorities in accordance with federal law