Historical clue formulations

• D.C. 100: Abbr. — 2025-07-27
• Ernst and Young, e.g.: Abbr. — 2022-02-20
• Biden and Harris, once: Abbr. — 2021-12-18
• State couple: Abbr. — 2018-07-21
• Hill workers: Abbr. — 2018-01-04
• Political century: Abbr. — 2017-07-29
• They sit for six yrs. — 2015-11-22
• Meaning: Fr. — 2014-01-12
• Professional filibusterers: Abbr. — 2013-12-03
• Filibusterers, e.g.: Abbr. — 2013-02-14
• D.C. 100: Abbr. — 2012-11-14
• Grp. on the floor — 2012-04-21
• Chamber workers: Abbr. — 2011-01-06
• A century in Washington: Abbr. — 2010-01-24
• Chamber workers: Abbr. — 2009-10-09
• Upper house members: Abbr. — 2008-12-08
• 45-Across and others: Abbr. — 2008-08-16
• Members in a 100-member club: Abbr. — 2008-08-13
• Chamber workers: Abbr. — 2005-03-12
• Lincoln and Kennedy, e.g.: Abbr. — 2004-11-27
• Chamber workers: Abbr. — 2004-11-12
• Boxer and others: Abbr. — 2003-09-06
• D.C. group — 2003-03-12
• Burns and Allen: Abbr. — 2003-02-06
• Byrd and Hatch, e.g.: Abbr. — 2002-12-30
• Burns and Allen: Abbr. — 2001-11-28
• D.C. pols — 2001-09-11
• D.C. figures: Abbr. — 1998-04-05
• Chamber workers: Abbr. — 1997-06-06
• D.C. figures — 1995-10-15
• D.C. pols — 1995-08-01
• Chamber workers: Abbr. — 1995-05-26
• Mikulski and Murkowski: Abbr. — 1994-03-15