For a Republican canvasser going door-to-door to get out the vote in the battleground state of Pennsylvania, the address on East Lake Road in Erie must have seemed like Heaven-sent evidence of the sort of widespread voter fraud many in his party have been complaining about since Donald Trump lost the election to Joe Biden in 2020.

Officials in a Pennsylvania county say an investigation is underway after election workers identified about 2,500 voter registration forms that may be fraudulent.

Signature verification is a layer in the checks and balances process of mail-in ballots in Colorado. It involves both an automatic review of signatures and the work of human judges to ensure that the signature on each ballot envelope matches the signature on file for that voter.