The position of the flag indicates whether the organization is partisan. Organizations are considered partisan if they operate on behalf of a candidate, party, campaign committee, PAC, super PAC, hybrid PAC, 501(c)(4), 501(c)(5) or 501(c)(6) organization that conducts a large majority of its political activity on behalf of one political party.

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Polls from firms that are banned by FiveThirtyEight are not shown. Pollsters that did not release any horse-race polls within three weeks of an election since 1998 do not have a grade and are treated as a C+ by the grade filter.

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Design and development by Ryan Best, Aaron Bycoffe, Christopher Groskopf, Ritchie King, Ella Koeze, Dhrumil Mehta, Jasmine Mithani, Mary Radcliffe, Anna Wiederkehr and Julia Wolfe. Andrea Jones-Rooy, Dhrumil Mehta, Mary Radcliffe, Nathaniel Rakich, Derek Shan and Julia Wolfe contributed research. Editing by Sarah Frostenson. Copy editing by Jennifer Mason, Andrew Mangan and Curtis Yee.