Historical clue formulations

• Philosopher who said "The people never give up their liberties but under some delusion" — 2017-02-26
• Philosopher who wrote "Superstition is the religion of feeble minds" — 2014-09-26
• "A Vindication of Natural Society" writer, 1756 — 2004-01-16
• Cleveland's ___ Lakefront Airport — 1997-07-09