Everything that Rove puts out is a calculated measure meant to affect the political situation in favor of the candidates that he is supporting (and, by extension, himself).  

Rove knows that polling this far out is effectively meaningless, and by predicting a drubbing by scary Democrat Obama, he thinks he can motivate the base.  We should not even be giving his drek the time of day.  I'm a little annoyed at Chuck Todd for even reporting it, but I do suppose that Rove is a legitimate newsmaker.  He made the last two presidential terms, after all.