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Here's a little more flavor from the tubes:
In last year's Philly race, Obama endorsed Rep. Chaka Fattah, who lost that race to current Philly Mayor Michael Nutter. As a result, as Philly blogger Will Bunch explains, Nutter endorsed Hillary some time ago, on the theory that the enemy of your enemy is your friend.
http://tpmelectioncentral.talkingpointsmemo.com/2008/03/obama_rueing_day_he_got_involv.php
Independent of the veracity of above article, it shows there are always many angles to consider when dealing with politicians. I personally don't know much about the city of Philly. It's reported that Nutter is popular at the moment.