Biden Dropped Out 3 Days Ago. Ready or Not, Here Come the Polls.
Briefly

Some have focused on speed; others have focused on thoroughness. Each approach has its advantages and potential pitfalls, grounded in the inherent tension between getting timely results and measuring public opinion in a broader and deeper fashion.
We do think it's important in moments like this, where the public is potentially shifting, that it's not just speculation about what's happening, that there is actually some data, some information, even if it may change said Chris Jackson, vice president of Ipsos Public Affairs.
A shorter period in the field can exaggerate a problem common to all polls: an inadvertent bias toward voters who are highly engaged and more likely to participate in polling. This could decrease accuracy in a race that could be decided by disengaged voters.
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