Florida providing the latest piece of evidence.
Meanwhile, look at where Rubio is going. Not to mention Scott Walker.
Source: Real Clear Politics
Poll of Florida GOP voters shows Jeb Bush, Donald Trump in close battle for Florida. (Florida Times-Union, 8/6/2015)
University of North Florida political science professor Matthew Corrigan said the results will likely be troubling to Rubio campaign managers.
“He has, probably more than the others in the single digits, the infrastructure and the campaign to catch fire later, but they have got to be concerned that he is in the single digits in the home state of Florida,” Corrigan said.
Trump outpolls Bush, Rubio in Florida. (7/29/2015)
Scott Walker taking a dive in Florida Republican presidential primary polling. (6/20/2015)
Tracking the Florida Republican Presidential Primary Polls (January-March 2015). (4/4/2015)
Bush-Walker-Unsure are 1-2-3 in latest Florida Republican Presidential primary poll. (3/3/2015)