Even besides the bizarre infinite thought-loop the Marcobot was stuck in... why does he even think repeating "Obama knows exactly what he's doing" (a liberal trying to change things in the country) is a good line or attack??
He was responding to the idea that he doesn't have enough experience. He has basically the same amount of experience that Obama had in 2008. So basically, he's saying, or at least, attempting to say, that Obama had enough experience, Obama is actually very skilled, except he's a nefarious evildoer, so as equally bad as Obama has been, Marco Rubio will be as good.
In essence, he's saying let's dispel once and for all with the ficiton that Barack Obama doesn't know what he is doing, he knows exactly what he is doing.