Well, it was definitely a learning experience for him.
-He needs a better staff, and he needs to stop micromanaging them.
-He needs to stay away from the Vietnam stuff, and focus on other issues.
-He needs concrete ideas, not "I have a plan."
-His plans need to be feasible, not "I will pay for everything with tax increases, but the tax increases will not pay for everything."
...etc.
He had a golden opportunity to become President, since Bush was such a weak candidate. He just blundered his way through the campaign and could not pull it off. He needs to actually accomplish something in the Senate over the next few years. Here is a thought: how about introducing the legislation he proposed during the campaign? This will prove that he is serious about his ideas and not just putting something out there in order to become President. His actions over the next few years will speak volumes, IMO.