source?
http://www2.cnn.com/ALLPOLITICS/anal...g/2000/08/03/:
Quote:
And after the 1980 Republican convention, Gallup showed Ronald Reagan with an eight-point bounce, while CBS/USA Today/Gallup showed Reagan losing two points.
Overall, the two sets of polls strongly suggest the nominees receive a bounce, but that it can range from statistically insignificant to the high single digits. Bounces larger than that have occurred, but they are relatively rare.
CNN Polling Director Keating Holland has conducted his own review of pre- and post-convention polls. But instead of relying on one or two companies, he has looked at the most timely poll each cycle (the one conducted as close to one week before the conventions and immediately after the conventions).
Holland found a bounce in the five- to seven-point range, with at least a couple (after the 1992 Democratic convention and the 1980 GOP convention) much larger.
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That's all I've been able to find. I don't see any documentation of the phenomenon you're referencing.