The thing with Rubio is that he got minor traction for a few weeks, but then was immediately shown up as a flimsy persona on a national level. That left Cruz, who is as dangerous as Trump but has better (or even some) advisors (in particular, the impressive Victoria Coates). Now both seem utterly irrelevant, even if the remaining 1% scorers drop out. I was driving around the Deep South in September with my father, when the first GOP debates were being shown and Trump was way on top. We were both like, yeah, this will level out, he'll be gone by January. Wrong again! Then again, we were also in America during Corbyn's victory, constantly getting updates on Dad's iPad. We thought Sanders was the relevant comparison, but it was obviously Trump.