The surest sign that Democrats know they are in trouble after Paul Ryan's nomination to the Republican presidential ticket behind Mitt Romney is the desperation with which they are trying, desperately, to steer the conversation away from the economy, entitlements, and the Constitution--with the help of the media, of course. This is the substantive debate that President Barack Obama always said he was ready for, and which the media always calls for in high-minded tones, but once it is here they are suddenly trying to change the conversation.