Historical clue formulations

• Vice-presidential family of the 1990s — 2019-09-30
• Prominent 1990s Washington duo — 2019-05-23
• Horns in on? — 2017-10-15
• Wounds at Pamplona, say — 2017-06-21
• Horns in on? — 2014-12-24
• Is piercing — 2013-02-02
• Impales — 2012-09-06
• Sticks — 2011-12-23
• Runs through — 2011-11-18
• Al et al. — 2010-06-27
• Tusks, e.g. — 2009-02-14
• Second family of the 1990's — 2001-07-03
• Tennessee political family — 2000-02-15
• Injures with a horn — 1999-12-27
• Al et al. — 1997-05-22
• Eminent Washington family — 1997-05-16