Speaking at a rally on Saturday, Trump repeated his lie that the last presidential election was stolen from him and again raised doubts about the integrity of the upcoming election. “We need to watch the vote. We need to guard the vote. We need to stop the steal,” he said. How can we conduct a presidential election when one candidate and his party continue to lie about the outcome of the previous election and sow doubts about the electoral system? Our system depends on trust. But if voters are repeatedly told they can’t and shouldn’t trust it because it is rigged, and a significant number come…