It’s hard not to notice the contrasts. Even before Obama picked Biden, Republicans were begging Obama to choose him. When Biden was selected, there were already several parallel narratives showing that he was, among other things, more exercised about a McCain candidacy than an Obama candidacy. And it was plain as day that his comparatively long experience in the Senate – extremely long, actually – would be unflattering beside Obama’s. Biden has eight times as much experience as the man...