Probably not. Also, the late voting undecideds were probably affected as they would have been more likely to pull the lever for the "already declared" winner.
The reports that Kerry was having such an early election success and the reports of being so far ahead in PA, and comfortably ahead in FL and OH probably cost Bush PA, WI, and NH. I voted in the morning but I can tell you that I was plenty depressed when I saw the early exit polls being reported and then that being translated into "body language" by the television pundits.
I don't think that the undecideds want to be able to say "I voted for the winner", I think that they DO vote for the majority poll candidate in the end in part because they concede their choice to those "smarter" than they are ("I don't understand who's better so I'm going to go with the one who won the debates and has peoples' confidence").
Subconsciously though, they may indeed want to vote for the winner (imagine being distraught over the decision of who to vote for, casting a ballot, and then LOSING; much easier to go with the "popular" choice, especially with the MSM pushing Kerry down everyone's throat).