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## Step 1<br />The problem is a reading comprehension question that requires us to logically complete the given text. The text discusses the difficulty in determining whether holding an elected office changes a person's behavior. The text also mentions the challenge of ensuring that the experiment has an appropriate control group.<br /><br />## Step 2<br />The text then introduces the idea of comparing people who hold elected office with those who do not, but who are otherwise similar. This comparison is used to control for other factors that might influence the behavior of the people being studied.<br /><br />## Step 3<br />The text then presents a challenge: if researchers cannot control which people will be elected, they will struggle to find valid data about the behavior of politicians who do not currently hold office. This is because the behavior of politicians who do not hold office may be influenced by a variety of factors, not just their current office status.