Historical clue formulations

• Donkey grp. — 2025-06-15
• Blues group, for short? — 2025-04-29
• Political org. with a quadrennial convention — 2023-11-26
• Blue grp. — 2022-12-08
• Left-leaning organizing grp. — 2022-04-10
• Party org. — 2021-06-25
• Blues group?: Abbr. — 2019-07-20
• Party org. once chaired by Tim Kaine — 2018-04-05
• Party org. — 2013-04-14
• Leadership org. opposed to the G.O.P. — 2010-06-06