New polling shows Biden still has strong support among black Democrats; another poll shows Harris, Buttigieg, Booker, and Castro did best in the second debate; Booker’s campaign staff unionizes; Hickenlooper keeps his options open; and the DNC clarifies the qualification timing for October.

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Links:

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• August 6, 2019 - Warren Up, Harris Down, But Biden Leads Among U.S. Dems Quinnipiac University National Poll Finds; 14 Dems Have Less Than 1 Percent (Quinnipiac University)
• Elizabeth Warren Had Another Very Good Debate, Poll Finds (HuffPo)
• HuffPost/YouGov Methodology (HuffPo)
• YouGov model design/margin of error info (YouGov)
• primary-2020-polls-warren-won-the-debate-but-biden-leads.html">Polls: Warren Won the Debates (But Debates Don’t Matter Much) (NY Mag)
• Poll: Dems say Warren reigned in second primary debates (Politico)
• Booker campaign staffers unionize (The Hill)
• Hickenlooper keeping his options open on Senate run as presidential bid struggles (CNN)
• DNC rules could expand, not shrink, future debate stage (Politico)