With so many candidates in both political parties, polls showing who's leading and who's not are more important than ever. Like the Republicans before them, Hillary Clinton and four other Democrats will be on stage tonight in Las Vegas because of their standing in such public opinion surveys. So-called "horserace" polls of their popularity even determine where candidates get to sit. But now that standard is being called into question by a polling firm with a reputation going back to Franklin Roosevelt's re-election in 1936. Frank Newport, editor-in-chief of the Gallup Poll, explains the decision.
Photo: Phil Roeder