The article compares elections where everyone votes at the same time versus one where people vote one after the other. They found that in simultaneous voting, the candidate who is better known is more likely to win. In sequential voting, early voters have a big impact on the outcome, especially if they represent the whole voting population. If the early voters don't represent everyone, the candidate they like the most is more likely to win. But if the early voters are not representative, the candidate who would win in a head-to-head match against any other candidate is more likely to win.