Updated: Oct 12
In 2016, almost one-quarter (33 million) of U.S. votes were cast by mail.
Research shows that neither party gains an advantage.
There is no evidence to show that mail ballots increase electoral fraud. Anti-fraud protections are built into the process which deters misuse. This includes: people requesting ballots are registered voters, ballots are mailed to addresses that the voters had used during registration, and voter signature is required on envelope. Further those who abuse the system can be charged with election fraud and potentially face fines or prison time.