I am not going to add any comment. Just a few links about the

Convention bounce

http://apr.sagepub.com/cgi/content/abstract/20/3/287

http://www.fivethirtyeight.com/2008/08/what-convention-bounce-looks-like.html

http://elections.foxnews.com/2008/08/28/gallup-poll-gives-obama-convention-bounce/

http://www.cnn.com/2008/POLITICS/08/31/obama.mccain.poll/index.html