Although Pennsylvania doesn't vote until late April, when the nomination is fairly likely to have been decided, I believe the paper gets some readers in South Jersey and Delaware, which both vote on February 5th.
The key part of their endorsement:
Obama inspires people to action. And while inspiration alone isn't enough to get a job done, it's a necessary ingredient to begin the hard work.
Obama's appeal to Americans to have the audacity to hope, even in the face of tragedies such as 9/11 and Hurricane Katrina, has fallen on fertile ground. Americans want desperately to believe they can overcome any difficulty - given the right leadership.
Of course, Obama needs to win South Carolina today, or it's over (a substantial margin of victory may be necessary, but victory definitely is), and I'm very nervous, having lost all trust in polls after New Hampshire.