It was obvious from the immediate response from the McCain camp that Biden's selection was planned for.
The Biden choice by Obama seems to have been a result of the recent foreign policy developments and the poll numbers indicating that most Americans do not trust Obama.
With all the talk of hope and change it is ironic that a 30+ year veteran of the Senate, a Washington insider was picked.
Biden has no leadership experience and like Obama has no experience running any government sized organization.
With Biden's moderate voting history, I think the McCain campaign will use every bit of sound and video bites to get that sliver of the population that mistrusts Obama!