How rare, really, is voter fraud?

Leading up to the midterms, questions and conspiracy theories have been floated about how secure elections in the US really are. CNN's Marshall Cohen traces the system of integrity checks and safeguards that prevent – and catch – voter fraud.

0:00 How do we know election fraud is rare?
3:52 Provisional ballots, explained
5:57 How does the ballot scanner work?
9:05 Investigating a potentially fraudulent ballot

Want more like this? Stream CNN Explains’ episode on Campaign Finance on the CNN app: https://cnn.it/3TqLEgD

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