According to The Heritage Foundation's Election Fraud Database, election fraud does occur in American elections.  Errors, omissions, and mistakes by election officials and careless, shoddy election practices and procedures or lack of training can cause and have caused problems for voters and candidates. While there is no accurate information on the extent of these problems, the number of instances in which such issues have occurred and are occurring demonstrates clearly the vulnerabilities in our current patchwork system across the states. The following recommendations of best practices have been developed by Heritage Foundation experts based on long experience in the area of election integrity. These recommendations are intended principally for state legislatures, which under our federal system have the primary responsibility for administering elections.

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The Facts About Election Integrity and the Need for States to Fix Their Election Systems | The Heritage Foundation