The ONLY reason that Rubio would get any nomination for anything would be because (1) he is thought to have great appeal to fellow Hispanic voters, and (2) it might be assumed that as a Floridian, he might get more votes from other Floridians.
In the even you do not know, Florida's Republicans elected the least popular governor we have in a very long time, a healthcare thief named Rick Scott, who basically bought both the nomination as well as the governorship in a three man race.
Here in Miami-Dade County, we had two candidates for county mayor, running as non partisans, but both were Republicans. Robaina was favored in an 11 man primary, but then he admitted he voted for Scott. The other, Gimenez, told us he voted for Alex Sink, the Democrat, because he thought Scott was a dishonest crook.
Gimenez won. Even though Luther Campbell who got 115 in the general election and carried all the Black precincts, endorsed Robaina.
The Republican Party has become poison here in Florida, thanks to Rick Scott, who has been writing his own favorable blogs lately.