Yes, Mr. Biden clears the curb-height hurdle of being more charismatic than Ms. Clinton. But Mr. Biden, first elected to the Senate in 1972, is arguably even more of an establishment figure than Ms. Clinton. Moreover, Ms. Clinton has at least a little room to distance herself from Mr. Obama. Mr. Biden has none. In fact, he gives every indication that he thinks the Obama administration has been a story of one brilliant success after another.