The understatement of the day from Barack Obama: "The way we're going to close the deal is by winning." No kidding.

But Tuesday's loss in Pennsylvania has the press focused on why he can't seem to win when and where he's had to this primary season, and just what that might mean for the general election. For a small sampling of this focus, see Adam Nagourney in the New York Times, Robert Novak, Mara Liasson of NPR, Rick Klein of ABC News, as well as Karl Rove, Jackie Calmes and Mary Jacoby in today's Wall Street Journal.

The Clinton camp couldn't be happier, of course, and the press' new fixation with the question of whether Obama can "close the deal" or not is one of the most under appreciated byproducts of Clinton's win on Tuesday: it changed the narrative. Unless the Obama campaign can find a way to change it back, it's going to be an exceedingly long two weeks until Obama gets another chance (not to mention his last chance of the primary) to show he's a closer and end this thing by sweeping Clinton in North Carolina and Indiana.