Since Gallup began presidential polling in 1936, only one candidate has overcome a deficit that large, and this late, to win the White House: Ronald Reagan, who trailed President Jimmy Carter 47 percent to 39 percent in a survey completed on Oct. 26, 1980.
Yet Mr. Carter, like Mr. McCain today, represented the party holding the White House in bad times. After Mr. Reagan successfully presented himself as an alternative to Mr. Carter in their lone debate, held on the late date of Oct. 28, he surged ahead. After two debates, Mr. Obama holds a lead that is approaching Mr. Reagan’s eventual margin of victory