Rand Paul goes on Rush Limbaugh's show and begins with a gaffe.

It's an attempted compliment:

RUSH: We welcome to the program this afternoon Senator Rand Paul from Kentucky. Senator, you got some sleep last night, I trust?

PAUL: Well, I did, but, you know, I was thinking of you when I was in the middle of this 13-hours. I got about five hours into it and I was like, "Well, Rush does four hours of this every day. Certainly I can do four more hours."

As anyone at all familiar with the Rush Limbaugh show would know, Rush does 3 hours. (If you subtract the commercials, it's less than 2 hours.) So right at the outset, Rush knows Paul doesn't pay much attention to the show.

RUSH: (chuckling) That's awfully nice of you to say, but I doubt that I was in your thoughts last night, although I appreciate the comment. 

This seems like a corresponding self-deprecating pleasantry, but listening to the podcast, I translated "I doubt that I was in your thoughts" to: I know you don't care about me.