Joe Biden wants to run on Barack Obama’s record. Oba­ma him­self, speak­ing at the Demo­c­ra­t­ic con­ven­tion last month, glossed over Biden’s own record while reas­sur­ing lis­ten­ers of Biden’s val­ue as a wing man: “For eight years, Joe was the last one in the room when­ev­er I faced a big decision.”