Holy crow. Team Obama has had a large enough influx of cash that they've decided to run TV ads in every February 5th state, and to ramp up advertising in LA (which they had previously avoided because of high cost and unfavorable demographics). To an extent, the decision to run ads in New York is more about getting votes in New Jersey and Connecticut, but if you've got the extra scratch, why not go all out? There's no real way to build any sort of organization in a week, so ads and local appearances are the only ways to change the game from here on out.
Clearly this is good news for John McCain.