This video, of Obama hammering McCain on the economy in Nevada, shows how dramatically the race has shifted amid the financial crisis:Obama keeps hitting McCain on his claim that "the fundamentals of our economy are strong," and, in what sounds like a suggestion that McCain is befuddled, repeats a now-standard stump line: "They sent him back a few hours later to clean up his remarks."Obama also quoted McCain's vow to take on the "old boys' network" in Washington, adding:The ol' boy network? In the McCain campaign, that's called a staff meeting. Only days ago it seemed like Obama was constantly on the defense. It's kind of extraordinary how much the financial crisis' shifting of the political environment, combined with McCain's ill-timed "fundamentals" gaffe, has made it possible for Obama to grab the offensive -- and on such favorable turf, too. But McCain is now making as aggressive a grab for the populist mantle as he did for the change mantle, so a lot still rides on the still-unsettled question of whether Obama can succeed in owning the economy as his issue.