Harry J. Enten cites these factors as militating against Sen. Marco Rubio’s chances of capturing the Republican presidential nomination in the next election cycle:
1. Republicans like to choose the next in line
2. Republicans choose the candidate backed by the establishment
3. Rubio is likely too conservative
4. Rubio is largely an unknown
5. A Rubio run would face a competitive GOP field
Enten’s arguments are detailed HERE.