I agree with president and strong, the "come out swinging" thing may or may not happen.
He won't go too far out of who he is and where he's comfortable for one debate. I was commenting more on that than what I think he should do. (I think he should have a lot of glaring eye-contact and somewhat aggressive body language, but I doubt he will.)
He will probably be rhetorically strong, but I don't think he's going to do a lot of the alpha-male steamrollering that Romney did.
Lehrer was a big part of that, allowing the steamrollering at the beginning and setting that tone.
I like Candy Crowley OK (she annoyed me a bit in the 2008 primary, other times I thought she was good), if she takes more control of the debate in that way that would help.
Obama was visibly uncomfortable in the first debate with figuring out how to navigate the loose definition of "turns." Wait and he looks weak, but fail to interrupt and he loses chances.