Actual presidential elections occur only every four years, but political polls operate every year, week-in and week-out, supposedly to give Americans a real-time sense of who is up and who is down in the political horse race. How do the political candidates themselves use polling as a strategic tool? Can Americans trust polls that are not based on random sampling? Why do polls taken at more or less the same time sometimes seem to point in opposite directions? Peter and Dale examine the evolution and current practice of opinion research with leading Republican pollster Whit Ayres and leading Democratic pollster Geoff Garin.