The Sanders campaign has built their own reporting system to check the results from the official Microsoft-backed app. It has trained its precinct captain on using the app, which is designed to be as user friendly as possible, and the campaign will also staff a hotline system as further redundancy.

“It’s just a way that our folks can have an app that we trust to get the numbers to us in a timely fashion,” D’Alessandro said. “I’m always going to be more for sure on the stuff that my people had control over the entire time… If there are any problems, we can spot them right away.”

Other Sanders aides noted that Microsoft employees have donated several hundred thousand dollars to Democratic frontrunner Hillary Clinton over her career, and questioned why the Iowa Democratic Party didn’t partner with a software company based in Iowa.