No sooner did President-elect Donald Trump name his pick for attorney general, Sen. Jeff Sessions, than allegations of racism began to fly. A writer at the website Slate lamented the Alabama senator’s “long history of racist words and bigoted deeds.” A headline at Salon called Messrs. Trump and Sessions “two peas in a racist pod.” Nonsense. The charge that Mr. Sessions is a latent racist is belied by a long trail of evidence, strewn with cocaine, through the country of Colombia.

The accusations stem from Mr. Sessions’s unsuccessful...