Mitt Romney sits at or near the top of almost every poll of likely Republican presidential candidates. He hasn’t worked hard for the distinction. While others swarm the early primary states, he has mostly stayed away. He’s the rare Republican hopeful not currently or recently employed by Fox News. In fact, he rarely appears on television at all. He’ll skip tonight’s Republican debate in South Carolina. And who knows? He may skip the next one, too. Romney has put the “invisible” in the invisible primary. Let’s give him his due: that looks more and more like a presidential-caliber decision. There...