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PITTSBURGHSenator Casey of Pennsylvania endorsed Senator Obama today, a move that could help the presidential candidate make inroads with white working-class voters dubbed "Casey Democrats" in the Keystone State.

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Senator Obama with Senator Casey today at the Soldiers and Sailors Museum and Memorial in Pittsburgh, Pa.
 Alex Brandon/AP
Senator Obama with Senator Casey today at the Soldiers and Sailors Museum and Memorial in Pittsburgh, Pa.

Appearing on stage beside the Illinois senator, Mr. Casey told a boisterous rally, "I believe in my heart that there is one person who's uniquely qualified to lead us in that new direction and that is Barack Obama."

Pennsylvania's April 22 primary will allocate 158 delegates, the biggest single prize left in the drawn-out nomination battle between Mr. Obama and Senator Clinton. Mrs. Clinton is leading Mr. Obama in the state, by 12 points in one poll this month.

Mr. Casey is a first-term senator and the son of a popular former governor of the state. Mr. Casey is Catholic and, like his father, is known for his opposition to abortion and support of gun rights. His support could help Mr. Obama make inroads among Catholic voters, who have preferred Mrs. Clinton to Mr. Obama in earlier primaries and strongly favor her in Pennsylvania polls.

"I really believe that in a time of danger around the world and in division here at home, Barack Obama can lead us, he can heal us, he can help rebuild America," he said.

Mr. Obama told the crowd that he had not pushed Mr. Casey hard for an endorsement.

"Bob is such a gracious person and such a thoughtful person that I did not press him on this endorsement," especially since Mr. Obama trails Mrs. Clinton in Pennsylvania polls.

"It would have been easy for Bob just to stay out of it, just to stay neutral, I think everybody would have accepted that," Mr. Obama said.

Mr. Casey said that he called Mrs. Clinton last night to tell her of his decision.

"She was very gracious. We know that she's a great senator, she's a great leader," Mr. Casey said.

Asked by Mr. Casey's endorsement, a Clinton spokesman, Mo Elleithee, said, "We're proud of the support we have from across Pennsylvania, including Governor Rendell, several members of Congress and mayors from across the state. We look forward to having his support in the general election as Democrats unite to beat John McCain and to turn our country around."

Mrs. Clinton's backers in the state include Rep. John Murtha, who was an early advocate of withdrawing from Iraq, and Mayor Michael Nutter of Philadelphia.

Meantime, a leading Obama backer, Senator Leahy, Democrat of Vermont, is saying Mrs. Clinton should abandon her White House run.

"There is no way that Senator Clinton is going to win enough delegates to get the nomination," Mr. Leahy told Vermont Public Radio in an interview that aired yesterday.

In a statement issued today, Mr. Leahy, the Senate Judiciary Committee chairman who endorsed Mr. Obama in January, said Mr. Casey's endorsement of Mr. Obama is the latest sign of how the race is going.

"Senator Clinton has every right, but not a very good reason, to remain a candidate for as long as she wants to. As far as the delegate count and the interests of a Democratic victory in November go, there is not a very good reason for drawing this out. But as I have said before, that is a decision that only she can make," Mr. Leahy said.

The Casey endorsement came as Mr. Obama began a six-day campaign swing through Pennsylvania.

Pennsylvania has an estimated 3.8 million Catholics, or just over 30 percent of the state's population, and the percentage among Democrats is estimated to be slightly higher.

Obama's team hopes that Casey will help narrow Clinton's huge lead among white working-class voters — men in particular. Clinton routed Obama among that demographic in Ohio and Texas on March 4, raising questions about his electability in November. In recent weeks, Obama has stressed economic issues important to the middle class, and he is outspending Clinton on television advertising that features blue-collar imagery.

Clinton and her supporters have been making their own direct appeals: backers Kathleen Kennedy Townsend and Robert F. Kennedy Jr., last week wrote a letter to Pennsylvania Catholics emphasizing her plans on health care, mortgage foreclosures and fuel costs. Clinton has been endorsed by Pennsylvania Gov. Ed Rendell, giving her access to his potent political operation.

Obama has lacked a major endorsement by a statewide Pennsylvania politician, and Casey's could help jump-start his Pennsylvania campaign. Casey has close ties to organized labor, which has been divided in Pennsylvania between the two candidates.

Casey had a 62 percent approval rating among Democrats in a recent Quinnipiac University poll.

Casey's move could also be seen as a political jab at the Clintons. Bill Clinton was the Democrats' presidential nominee in 1992 when Casey's father was not given a prime-time speaking position at the party's convention, which outraged many of the state's conservative Democrats.

Casey was to campaign with Obama as he travels across Pennsylvania by bus.

The bus tour will feature "listening sessions," a technique Clinton used in her 2000 Senate campaign to convince skeptical New Yorkers that she was not just a carpetbagger looking for a plum post after leaving the White House.

Obama hopes to prevent Clinton from racking up a large win in the state which could eat away at his delegate advantage and give her new life in the final primaries running to June.

It may be a tough sell for some in the state, which has a sizable elderly population. In the previous primaries, older Democrats have favored Clinton, while younger voters tend toward Obama.

Casey served two four-year terms as state auditor general. He lost a 2002 gubernatorial bid in the Democratic primary to Rendell.

Casey was elected to the Senate in 2006, defeating conservative GOP incumbent Rick Santorum. Obama campaigned for Casey, but so did Clinton and her husband.