In a rare show of unity, politicians from across the spectrum were quick to condemn Donald Trump for suggesting that the vote might be rigged. That is not surprising because it is a subject they don’t want voters to think about.

Part of the criticism is justified. The type of voter fraud Trump suggests — and GOP-run states are using to justify voter suppression laws — is extraordinarily rare. But there is no doubt that the election could be rigged on a much larger scale.

Now, less than three weeks before the election, it is worth revisiting the video below, which shows how easily a voting machine can be manipulated.

CLICK HERE TO WATCH: Princeton University Exposes Diebold Flaws