Marco Rubio is likable. That likability is his chief asset. Even as he champions a wildly unpopular bill among his own base, his numbers remain high. It’s not just magic. Rubio is everywhere. If you tune in to Univision, you can hear him promising legalization. If you watch FOX News, you’ll hear him express disappointment in his own bill, almost sounding as he might not vote for the very thing that he has staked his entire career on. There are many Rubios. At times it seems as if there are as many Rubios as there are Obama. A flock of...