In many of Tuesday's closest races, states will use those same old, suspect voting machines.

Slate Magazine: "Even in the rare cases in which the paper trails are reviewed, they offer no verification that voters actually meant to vote the way the little printed receipts might show. Studies by CalTech and MIT have found the vast majority of voters either don't bother to check their receipt or don't notice printed errors on it. Another study from Rice University found that when voters do bother to review the electronic summary at the end of the voting process, about two-thirds don't notice when the computer has flipped their votes"