Sen. Hillary Rodham Clinton won Tuesday's Pennsylvania primary by nearly 10 points, but that wasn't sufficient to make the state's remaining six uncommitted superdelegates jump off the fence to support her.

Calls by the Pittsburgh Post-Gazette yesterday to all six -- five of them congressmen, one a state labor leader -- uncovered no changes in position.

For two local undecideds, both of them congressmen, the reason seemed to be a mix of practical political calculation leavened with a dash of idealism.

"The easy thing would be to endorse and get it over with, but I'm trying to be thoughtful and do the right thing," said U.S. Rep. Jason Altmire of McCandless, whose 4th Congressional District went for Mrs. Clinton by nearly 30 points but who is waiting until June 3, when the primary season ends and he can decide based on popular vote and delegate totals.

"I just don't want one candidate to be perceived as a winner and have party insiders nominate someone else," he said.

"I'm a great believer in democracy," said U.S. Rep. Mike Doyle of Swissvale, whose 14th District went for Mr. Obama, 52 to 48 percent, one of only three congressional districts -- the other two were in Philadelphia -- that Mr. Obama won.

"I met Hillary Clinton for breakfast a few weeks ago when she was 18 points ahead in the polls," Mr. Doyle said. "I told her, first of all, that both candidates would be great presidents but right now, Barack Obama leads in the popular vote and pledged delegates, so on what basis could I justify endorsing her? She told me, 'I understand but I think I can change the math.'"

Mr. Doyle nonetheless sounded skeptical that she could.

"I'm not saying I have a crystal ball but if you look at the next nine races, she would have to win each primary 60-40 to get close to the numbers she needs" and even then it was questionable, he said.

As of yesterday, Mr. Obama led in pledged delegates, 1,732 to 1,592, according to an Associated Press tally; Mrs. Clinton led in an estimated count of superdelegates, 259 to 235. The total number of delegates needed to clinch the nomination is 2,025.

Mr. Doyle said he is not worried that the current battles will damage the party in November.

"Primary battles are tough. I'm in this business. I know what it's like. The party needs to unify after the primary is over, but this is much more personal for the candidates. I don't like to see it, and in a perfect world I wouldn't want this to happen. The bottom line, though, is that people don't obsess on these things."

Bill George, head of the Pennsylvania AFL-CIO, could not be reached for comment, but he has repeatedly said he will hold out for as long as possible before making a decision.

The three remaining undecided delegates, U.S. Reps. Christopher Carney of Susquehanna, Robert A. Brady of Philadelphia and Tim Holden of Schuylkill, could not be reached for comment, but all three have the same problem, said Marcel Groen, a superdelegate who heads the Democratic Party in Montgomery County.

Mr. Brady's district went for Mr. Obama by nearly 90 percent, while Mr. Carney's and Mr. Holden's districts overwhelmingly went for Mrs. Clinton. Mr. Brady, who is head of the Philadelphia Democratic Party, "may prefer to be in a position where his decision has some meaning," Mr. Groen said.

Mr. Carney issued a statement saying only "I take my role and responsibility as a superdelegate very seriously. I'm going to weigh the arguments and take everything into account. Certainly, what's happened in our district will be the single biggest factor in casting my vote as a Superdelegate. I want to do what's best for our country and what's best for our district. But the time for that decision is later."

Mrs. Clinton now has 15 Pennsylvania superdelegates in her column -- compared with five for Mr. Obama. Three more from the state will be selected at the party's convention.

"I'm fine," said Mr. Doyle. "I feel no rush to do anything. We have plenty of time. If we want to wait until June 3rd and give the remaining primary states the pleasures and privileges Pennsylvania had, I don't begrudge them. In the end if Mr. Obama is ahead in the popular and pledged vote, I won't deny him in those categories. If [Mrs.] Clinton is ahead in the popular vote, and he is ahead in delegates, then she can make an adequate case for the nomination and I'll listen to her."