How do you read polling numbers when they're all different?

Polling numbers can range drastically from poll to poll, sometimes showing one presidential contender far ahead of the other while another shows the two neck-and-neck. How do you know what to believe? (Natalie Fertig / McClatchy)
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Polling numbers can range drastically from poll to poll, sometimes showing one presidential contender far ahead of the other while another shows the two neck-and-neck. How do you know what to believe? (Natalie Fertig / McClatchy)

Clinton’s lead over Trump shrinks dramatically

July 13, 2016 06:00 AM