Mr. Rubio’s failed effort at immigration overhaul exemplifies the challenges he faces. He held twenty percent of the vote in primary polls at the beginning of 2013, but his standing collapsed along with immigration and has never recovered. His ill-fated effort may not be on the minds of most voters today, but he lost the support of many on the right. And in later renouncing his own reform effort, he lost credibility with much of the center-right. In the end, he was on the side of no one.
— Nate Cohn: Marco Rubio is talented, but out of position (New York Times)