Answer: maybe there's a tiny bit more interest than in 2004.
But not that much: "Nielsen provided a breakdown of the audiences for all of the debates so far, and the answer is: Far fewer than would watch the lowest-rated prime-time show, but, that said, they have at times drawn at least a couple of million viewers."
Always remember: most Americans don't care that much about politics, and don't follow it too closely.
But that doesn't mean you shouldn't.