Mainstream Republican donors and elected officials flocked to Sen. Marco Rubio (R-Fla.) on Monday amid a growing sense that he is the last best chance to prevent Donald Trump from running away with the Republican nomination.
But Rubio’s path remains narrow and perilous. He has yet to win a state, and a raft of major March 1 contests known as “Super Tuesday” offers few obvious chances for him to do so. And if Trump keeps racking up wins, it will become more difficult to blunt his progress.
