If you ever watch, listen, or read the news, you’ll hear about political polls. There are polls for almost everything: Special congressional races, the popularity of the Iran Nuclear Deal, and, of course, the president’s approval rating. According to polling experts Courtney Kennedy and Fred Yang, the barriers to conducting wide-reaching polls have diminished over the past several years, allowing new pollsters to enter the fray. We look at why not all polls are created equal.