With mid-term elections fast approaching, Andy Crosby, an expert on political polls and surveying methodology, discusses whether the polls can be trusted and which ones he is watching.

Most political scientists and prognosticators predict a GOP win in the U.S. House of Representativeson Nov. 8, and so much of the media’s focus has turned to a tighter suite of contests – those for U.S. Senate seats. UC Riverside political scientists and other social scientists were polled recently on...