Welcome Michael!
In my opinion the reason that the GOP didn't get much of a bump is because not many people were watching the convention.
30 years ago the three the television networks devoted time to the conventions so people had two choices; watch the convention or read a book.
Today there are hundreds of cable / satellite channels and there is a whole world of on-line offerings as well as DVRs and NetFlix where people can spend their evenings. A wide variety of choices means fewer eyes are on any one thing.
The other reason people don't watch the conventions much anymore is because nothing of importance happens there.
I predict Obama too will have the bounce of an uncooked chicken breast hitting the countertop.