Historical clue formulations

• Poem so beloved by Abraham Lincoln that he carried it in his pocket and memorized it — 2026-02-13
• Classic poem set in "bleak December" — 2021-12-30
• Poem that begins "Once upon a midnight dreary" — 2019-12-04
• 72 of its 108 lines end in "-ore" sounds — 2016-04-29
• It uses 20 different end rhymes for "ore" — 2010-11-27
• Poe classic — 1998-07-02
• Poem mentioning "the lost Lenore" — 1996-05-12