Historical clue formulations

• White House sight — 2016-12-18
• President's workplace — 2016-02-15
• *Bushes were once found there — 2013-06-13
• See highlighted letters intersected by this answer — 2011-10-16
• Center of power — 2007-12-06
• Where the President works — 1999-03-08
• Center of power — 1997-07-17
• See image — 1995-08-27