Voter fraud is a nationwide concern, and GOP vice presidential candidate Mike Pence called Wednesday on Americans to keep an eye on their local polling stations.
"We certainly had instances that have been prosecuted in the state of Indiana over the last 10 and in 15 years," the Indiana governor told CNN's "New Day" program. "There were revelations yesterday by the FBI that a couple of state election systems had been hacked."
In Indiana, technology experts have been reviewing the security of voter files, said Pence, but private citizens are also important in keeping the nation's polls honest.
"Elections happen one precinct at a time and people that are involved in this movement are people who want to make America great again," said Pence. "We have always vouchsafed the integrity of the one-person, one-vote system, and we'll continue to, but I think skepticism is well founded."
No matter what party, vigilance against voter fraud is "essential to any vibrant democracy," said Pence.
However, CNN anchor Alisyn Camerota pointed out that it would not be possible for poll workers to detect computer hacking, but Pence said that neighborhood precinct workers generally know the people who come through to vote.
"That's the reason why in the state of Indiana, in states all over the country, elections are administered in a very personal and very intimate way on a precinct-by-precinct basis," said Pence. "We have had incidents in recent years, not only in Indiana but around the country, of voter fraud. I think the progress that we've made in the state of Indiana in voter ID laws ensure that everyone's vote count is important.