In truth, and while there are other dynamics going on, the central issue is just sheer volume. There's vastly more public interest in, and coverage of, Obama. His rise is a better, newer, story. That means that McCain's message has been muted; but his missteps are too. He's been able, in particular, to make it this far with a domestic policy agenda whose sheer vagueness wouldn't have made it through the Democratic primary.
