i want to bring in our correspondent, johnathan karl. as you know, romney and rubio are going to campaign together monday. one of the key battleground states, pennsylvania. this was set up before the primary was all but over. but it was what rubio said during an interview that is really stoking speculation tonight. i want to get your reaction. >> three, four, five, six, seven years ago, if i do as good job as vice president -- i'm sorry -- >> you guys all got that, right? >> as a senator. >> you got that, right? >> if i do a good job as a senator instead of vice president, i'll have a chance to do all sorts of things. >> well, john, is the cat out of the bag? >> reporter: yeah, the great thing about that, david, in the very same interview, just before that, he said if he were offered the job of being mitt romney's running mate, that he would turn it down. what that shows he's been thinking a lot about this and also explains why nobody believes marco rubio when he said he won't take the job. turning down a hypothetical offer is a lot diff