Obama’s bounce is less than a third of what Al Gore received in 2000 and Bill Clinton received in 1992. Even Bob Dole, following the 1996 Republican convention, received a 4-point bounce in the polls, 1 point more than Obama.
I don't really think bounces mean shit but it's hard to compare different election because of enviroments of each election.
Everyone is inundated (spelling?) with so much information nowadays pre convention..much more so then past elections where the convention was people's first introduction to the actual election.
Also, Clinton saw Perot just drop out too which let a lot to his 16 point bounce.
http://media.gallup.com/poll/graphs/080820Bounce1_kjmnbvc.gif
I didn't even expect any bounce what so ever because I feel that the public has been tuned in (well more so than in the past)
Anyways, bounces are generally a good measure of nothing.