Our guest is Anthony Salvanto, the Director of Elections and Surveys at CBS News. He currently conducts all polling across the nation, states, and congressional races, and heads the CBS Decision Desk that projects outcomes for various elections. He has a new book out, which he tells us about; the book is called "Where Did You Get This Number?: A Pollster's Guide to Making Sense of the World." As was noted by Kirkus Reviews, Salvanto -- who was, in fact, less surprised by the Trump election that were most of us -- offers "a revealing look at the numbers, how they're derived and interpreted, and how they sometimes fail us. [This is] timely reading for the coming midterm elections."