Donald Trump's list of vice presidential candidates apparently includes Governor Christie, Newt Gingrich, Senator Sessions, and Governor Pence. I'm usually not in the business of offering political advice, and I'm even less in the business of suggesting that jobs be allocated on the basis of race or gender rather than other qualifications. I like Mr. Pence, and I can even see the attraction of Mr. Gingrich, though I think picking Mr. Gingrich would be a mistake. But if I were Trump, or a Trump adviser, I'd be trying really hard to find a qualified woman, black, or Hispanic running mate. Trump's view may be that what he called "the dishonest media" might portray him as racist and sexist even if he chose Thurgood Marshall, Cesar Chavez, or Susan B. Anthony as his running mate. That may be correct. But in view of last week's shootings, a presidential ticket consisting of two white men may be a little too retro for 2016 America.