Slate’s Mickey Kaus asks a good question:

What do the Democrats do when Obama loses Pennsylvania, not by 10 or 15 points but by 20 or 25 points? That seems to be the way things are headed. …

And, indeed, the polling trend from Pollster.com looks pretty grim (and this is before the Jeremiah Wright controversy fully registers):

Given the demographics of the state and the Jeremiah Wright controversy, there must concern in the Obama camp. Most pundits expect him to lose, but to get annihilated could make some undecided superdelegates very nervous (though, as I’ve argued, it wouldn’t necessarily mean much in terms of the general election).

Update 3/20 1:38 PM: Just to clarify, my point with the graph was that Obama didn’t appear to be closing the gap as we might have expected. Indeed, some recent polls suggest a larger gap than the estimated trends and, as I said, these were taken before the Wright controversy fully registers. For instance, the RCP average of recent polls is 51.8 to 34.2 and the last six polls show Hillary leads of 26, 16, 12, 13, 19, and 14.