One problem is that hardly any public pollsters went into the field just before or just after the DNC, making it difficult to assess the bounce.
Convention bounces seem to have become smaller during the past few cycles, perhaps as a result of polarization, impacting how we interpret polling data.
Even if you conclude there was no significant convention bounce for Harris, her pre-convention surge was the functional equivalent, as noted by Amy Walter.
Collecting data before convention results are released complicates understanding public opinion shifts occurring during and immediately after the DNC.
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