You know, when a Democrat comes out and says something like that, I am skeptical. It’s more likely that the reality is exactly the opposite of what he is saying; ie that they are really not scared of Rubio and they don’t think he will do much at all to influence the Latino vote. Otherwise, they would keep their mouths shut rather than give their enemies good advice.
I read the leftwing sites regularly for the DUmmie FUnnies. Believe me. They are truly scared of Rubio.