Actually an Experienced VP is a greater asset than an Experienced President.
The Vice President is more than just a backup should the President die. He is the Statesman, The Negotiator, The Deal Maker.
Look at Cheney, everyone in Washington knows he is the Power behind the Throne.
Biden has 30 Yrs of contacts, a reputation of honor and integrety that even the Media cannot crack and knows the ropes in Washington.
Sara Palin, on the other hand has No Contacts, Did not have a REAL background check, has several questionable decisions on her record ( the bridge to nowhere, troopergate ect). Things that will probably come back to haunt her and McCain. Next Palin has "Jumped over" how many Washington Insiders who will think they should have been considered for the VP Chair instead of this unknown, how many will try and sandbag her while she tries to learn the Ropes of Washington?
No an Experienced VP can be a Presidents greatest asset.
An Inexperienced VP can be a disaster in the making.