Historical clue formulations

• Imagist poet Doolittle — 2020-02-22
• Broom-___ of the comics — 2016-02-10
• Betty's sister on "Ugly Betty" — 2014-12-20
• Margaret Thatcher's middle name — 2013-04-18
• Secretary on "Hogan's Heroes" — 2010-02-19
• "Broom-___" — 2008-08-24
• Broom ___ (comics witch) — 2007-05-20
• Imagist poet Doolittle — 2004-04-04
• Margaret ___ Thatcher — 2002-03-22
• Broom-___ (comics witch) — 2002-02-24
• Broom ___ (comics witch) — 2001-03-27
• Poet Doolittle — 1999-11-07
• Broom ___ (comics witch) — 1998-01-07
• Imagist poet Doolittle — 1994-01-29