She isn't her husband, but I think she looks presidential enough coming out of very tough Democratic debates while Rubio fades in and out of the Republican patty-cake debates. General election debate questions are going to be a lot closer to the questions Hillary has seen than what Rubio has had to answer.
I think you will have audience questions right? Hillary is a robot, come on, no way she can connect. This is where Bill did great, he wiped the floor with bush. And Rubio connects in some way, whatever stupid things he doe say.
I personally think Rubio is a reasonable debater. He has this youthful appeal, not too horribly anti-immigrant either. Cheers - Only the future will decide!!