People still nervous that Barack's campaign isn't being tough enough on McCain or that the Biden pick was less than inspiring should watch his speech from last night.
On the campaign trail, the VP nominee's job is to bolster any perceived weakness of the presidential candidate and to act as attack dog, allowing the boss to stay above the fray. This latter point is even more true if you're running a "positive" campaign of change v. a demonizing campaign of the opposition. Biden is perfect for this role. And I cannot wait to see the debates.