Campaign spokeswoman Jen Psaki said the endorsement will come as Obama begins a six-day campaign swing through the Keystone State.
Pennsylvania is the next big prize in the tough primary contest between the Illinois senator and Senator Hillary Rodham Clinton of New York. Clinton holds a double-digit lead in recent polls of Pennsylvania voters.
Casey is a first-term senator and the son of a popular former governor of the state. His support could help Obama make inroads among Catholic voters. Catholics constitute more than 30 percent of the state. Casey is scheduled to join Obama in Pittsburgh Friday and campaign with him as Obama travels by across Pennsylvania by bus.
[Associated
Press; By DEVLIN BARRETT]
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