Assertiveness

Here's what's wrong with the Obama campaign -- straight from Atrios quoting Chris Matthews and Joe Scarborough:

MATTHEWS: Now, it'll die, as we said, it'll jump the shark. Two days ago, no, we're all talking about -- you're waving the tabloids around, come on. Two days from now -- I want to ask you, what will we talk about two days from now?

SCARBOROUGH: Whatever the McCain campaign wants us to talk about, because the McCain campaign is assertive.

Why isn't the Obama campaign assertive too?