Remember when First Lady Michelle Obama was off-limits to political satirists? Comedians know not to cross certain lines with their jokes. Take the First Family. It’s all well and good to mock the president, but the First Spouse is a different matter. That’s how it was for eight years when First Lady Michelle Obama lived in the White House. And good for that. She wasn’t the president. It’s certainly reasonable to send a gentle barb or two her way. She’s a public figure, after all. More than that? Inappropriate. Now that Melania Trump is the country’s First Lady, all bets...