FWIW the same thing happened to Obama in 2008, at least in the key swing state of Virginia. I did some campaigning there for Obama the weekend before the election and the system that managed their get-out-the-vote efforts had crashed statewide. The precinct captains were handing volunteers old printouts of where to knock on doors and then using a highlighter to mark your route on a Google Maps printout. Given the limitations it was still an effective system for organizing a lot of volunteers.