One candidate paraded his veep choices through Twitter and openly mused about their qualifications. The other kept her shortlist confidential and her opinions private. One had instant regrets about his decision. The other always seemed to be heading towards the same destination. One needed a safe pick to balance his own volatility. The other chose a safe pick because they are kindred souls in earnest wonkery. Both in the manner of their selection and the content of their character, the veep picks of Donald Trump and Hillary Clinton open yet another chasm between the Republican and Democratic nominees. Don’t be...