Historical clue formulations

• Nominee's place — 2021-03-14
• Chad's place — 2018-07-20
• Where "X" may mark the spot — 2016-07-20
• Plebiscite, e.g. — 2014-08-31
• See 1-Across — 2012-11-06
• X-box setting? — 2011-06-17
• After 66-Across, election standard — 2010-07-15