Sam Wang: “Such high stability in polls is not new. It started several decades ago. One measure of the stasis of modern campaigns is how much each party’s support in polls changes over the course of a campaign. From 1952 to 1992, the average range — the difference between maximum and minimum levels of support — was 17 percentage points. Since 1996, the range has dropped to 8 points. Mr. Trump’s range is 4 points, from 39 to 43 percent.”
“At his lowest point, Mr. Trump still had more support than George McGovern, who got the smallest percentage of the popular vote by a major party candidate in the postwar era in 1972, with 38 percent. Mrs. Clinton’s average margin over Mr. Trump of five points has been enough to make her the first candidate to maintain a durable lead in an open presidential race since Dwight D. Eisenhower defeated Adlai Stevenson in 1952. So the bigger question is not about Mr. Trump, but why the last six presidential campaigns became so stable.”
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