"For eighteen long months, you have stood up, one by one, and said enough to the politics of the past. You understand that in this election, the greatest risk we can take is to try the same old politics with the same old players and expect a different result. You have shown what history teaches us - that at defining moments like this one, the change we need doesn't come from Washington. Change comes to Washington. Change happens because the American people demand it - because they rise up and insist on new ideas and new leadership, a new politics for a new time."

He is bringing "change" so he picks Biden as a running mate. What the heck kind of change is that? And an attack dog senator at that.
As for Palin, for the last two years while she was running a state, Obama was running for president. She has more substance in her baby finger than he does in his whole body.