But it never happened. Last night the establishment favorite one won state- Minnesota. Meanwhile, his rival for the right to challenge Donald Trump, Ted Cruz, won primaries in Oklahoma and in the delegate rich state of Texas.
So what now?
For weeks, Rubio's supporters have been urging Ted Cruz, who they say has no path to victory, to drop out of the race in the interest of the party. Now that the chips are down, will the Florida Senator do the same?