Historical clue formulations

• Bart and Lisa's dad — 2019-05-13
• Animated TV character who cries "D'oh!" — 2015-12-07
• TV character who says "It's 1 a.m. Better go home and spend some quality time with the kids" — 2009-12-07
• Speaker of the quip starting at 27-Across — 2007-01-10
• ...TV character? — 2000-10-01
• Dimwitted cartoon dad — 1996-03-04