There was a lesson to be learned there, and Obama learned a bit, but Obama didn't quite absorb the entire lesson. Obama absorbed the need to thoroughly vett his appointments, he just hasn't stage managed the process as well as he might. Obama's vetting process is weeding out people who should not hold appointed office, but it is doing it at the cost of a certain amount of embarrassment.
The withdrawal of Daschle is neither a "disaster" nor a "debacle" as some have tried to describe it. What it really is this: accountability. Daschle screwed up and Daschle is out, period. That's acountability folks and it can be messy at times, but we can take comfort in the fact that someone with an unsuitable background was prevented from taking appointed office.
In the final analysis, the full lesson of McCain-Palin and Obama-Daschle is this: thoroughly vett your appointments before you publicly announce your appointments.