Any of the top 3 Republican candidates would make a great Prez, all very different, all have strengths and weaknesses.
It is very obvious the Establishment is trying to push Rubio. I hope this does not succeed.
I would hope that these Republican candidates would form a coalition to save the country, after it becomes clear who the Repub nominee will be. For example, if it is not to be Trump for Prez, then make him Sec of State. Put Carson in a similar job.
Having said all that, I'm good with saying I support Trump.
I wouldn't rate Marco Rubio among the top 3 right now. Apart from a few polls by biased surveyors, he hasn't crossed the 10% barrier yet. For me, the top 3 Republican contenders are: Donald Trump, Ted Cruz and Ben Carson. And here is my suggestion:
POTUS: Donald Trump
VP: Ted Cruz
Sec of State: Ben Carson
Rubio is 4th, but The Powers That Be are angling to get him #1.
Interesting idea, Ben Carson as SofS. He is somewhat of a peacemaker, but that means he can be taken advantage of.
All of these guys are in my opinion, true statesmen. Cruz appears to me to be a match for Reagan.