David Petraeus was eager to hear about Dwight D. Eisenhower’s reported affair with Kay Summersby during a dinner in Washington with historian Jean Edward Smith, according to an anecdote in Smith’s forthcoming biography of George W. Bush.Smith, who also wrote a biography of Eisenhower, surmises that Petraeus's interest in the former president’s love life might have been part of an effort to move past his own highly publicized affair with Paula Broadwell ahead of a possible run for the White House.During the dinner, Smith writes in a passage buried in a footnote of his new book, the retired four-star general and former CIA chief brought up the subject of Eisenhower’s relationship with Summersby.“Much of the rest of the meal was devoted to my explaining how Eisenhower had put the affair behind him and successfully run for president in 1952,” Smith writes.