No, pretty much defined Palin for myself. And Biden is not a good VP, but compared to Sarah Palin he is light years ahead of her in almost all trades that make a person but fa decent vice presidential candidate.
But, I do not think that Biden should take it upon himself to run for president in 4 years, he is not suitable for a full presidency IMHO but for a short stint of being a president (in case something should happen to Obama) he is reasonably acceptable whereas Palin was just not presidential material, not even vice-presidential.
Biden served for about 36 years in the Senate, was chairman of the senate committee on the judiciary, chairman of the international narcotics control caucus and was chairman of the senate committee on foreign affairs.
Now Biden might be a long winded, experienced, foot in mouth, know it all kind of a guy with political positions in the liberal category , but I would still prefer that to an inexperienced, foot in mouth, one liner, mama bear kind of a person with political views that are way too conservative to appeal to most voters.