Historical clue formulations

• Pulitzer Prize-winning poet Conrad — 2020-04-25
• Poet Conrad — 2018-07-12
• George ___, Vermont senator for 34 years — 2018-01-11
• Pulitzer-winning poet Conrad — 2016-11-08
• Singer-turned-politician Clay — 2014-12-03
• Poet Conrad — 2013-03-31
• Conrad who wrote "Ushant," 1952 — 2010-11-26