Originally posted by Wotan
This quote here seems contradictory. With the "smallest bounce" in the history of their poll how can they claim Kerry's speech had a significant impact?
Keep in mind that the proportion of undecided voters to those who have already made up their minds seems particularly small this year (only about 10-15% were undecided in July). Thus by definition Kerry could not enjoy the kind of 10 to 15% bounce that most opposition candidates enjoy after their conventions unless he drew on a substantial portion of declared Bush voters as well as the undecided voters.
If you see Kerry's "bounce" in terms of the percentage of undecided voters, he has made significant inroads and attracted nearly half them to seriously consider voting for him. If these undecided voters remain firmly in Kerry's camp, then Bush faces a Herculean task during his convention to sway them back again.
Keep in mind that bounces tend, as political scientists describe it, to decay to the equilibrium. That is, post-convention bounces exaggerate the effect initially and then drop until they reach the actual level of support. This level may be the same as before the convention, or the level of support may have permanantly increased or decreased. See where those support numbers stand in a couple of weeks.
-- Todd/Leviathn