From the summary:
On Election Day, Nov. 6, the stakes will be high. A number of critical races will be very close, and some might be decided by very few votes. At the same time, it is highly likely that voting systems will fail in multiple places across the country. In fact, in every national election in the past decade, computerized voting systems have failed – machines haven’t started, machines have failed in the middle of voting, memory cards couldn’t be read be read, votes were mistallied or lost.
Our elections are so complex, with so many different jurisdictions and varying technologies, that problems are inevitable. And, as the technology used for elections has become more complicated, the opportunity for error has substantially increased.
This report reviews how prepared each state is to ensure that every eligible voter can vote, and that every vote is counted as cast. Because we cannot predict where machines will fail during the upcoming national election, every state should be as prepared as possible for system failures.