Polls offer a snapshot, but not always reliable predictions

Aired: 12/9/2015 | 0:10:32 | Clip
Early polling often doesn't reflect who goes on to become president (think Howard Dean or Newt Gingrich). These days pollsters acknowledge they are wrestling with a sea change in polling methods that's making it harder to collect a sample opinion of Americans. Judy Woodruff reports as part of a collaboration between The Atlantic and the PBS NewsHour.