Even if true, it does't matter in the least. 35% support is more than enough to win enough states.
I assure you, Rubios 21% voters in Florida will not vote for Trump or will simply sit out the election thus guaranteeing a Hillary win in a pivotal state. Is this what we want because of blind adherence to a con man and snake oil salesman.
Isnt Trump the guy who said his sister, a federal appeals court judge, who fondly and passionately embraced partial birth abortion, will make for a supreme court justice? Isnt Trump the guy who gave boatloads of cash to Reid, Pelosi, and the Clintons and the criminal Clinton Foundation and now tries to inoculate himself by saying he acted like like a businessman, or isnt Tromp the guy who has still has not released his tax returns for fear of what it will show: large donations to LGBT and Planned Parenthood.