Historical clue formulations

• President who married one of his kindergarten classmates — 2026-07-04
• "Dewey Defeats ___," infamous Chicago Tribune headline of 1948 — 2022-11-29
• Harry or Bess in the White House — 2016-12-18
• Roosevelt's successor — 2013-02-03
• Whom "Dewey Defeats" in a classic Chicago Tribune headline — 2012-10-22
• Winner of 1948 — 2012-10-09
• Marshall Plan signer — 2008-07-19
• "Plain Speaking" biographee — 2006-04-21
• Author of "Murder in the White House" — 1994-03-26