(Once you can fake sincerity, the rest is easy.)

“I know nothing.”

Remember that line? Once upon a time, “I know nothing” was the trademark alibi of Sergeant Schultz, that inept but lovable Nazi from the 1960s sitcom, Hogan’s Heroes.

Nowadays, it’s official White House policy.

Lately, it’s been a tricky exercise, trying to keep up with the news oozing out of the Oval Office. Over the last few weeks, the pathologically bumbling White House has managed to make itself the tabloids’ favorite filth, t...