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“They are women who really wanted to hear directly from someone who knew Senator Obama to try to answer their questions and their reservations that they had,” she said during a breakfast sponsored by the Christian Science Monitor.

Mrs. Clinton, in an attempt to dismiss any lingering doubts about where her support lies, said she would release her delegates, freeing them to vote for Mr. Obama.

“We are gathered here in Denver for a very clear and simple purpose, and that is to come out of this convention energized and excited and ready to elect Barack Obama as the next president of the United States,” Mrs. Clinton said at the New York state Democratic delegation breakfast. “And now what I ask each and every one [of my supporters] is to work as hard for Barack and Joe Biden as you worked for me.”

Yet Mrs. Clinton stopped short of telling her backers how to vote, saying that she understands her supporters’ frustrations and realizes some of her delegates won’t heed her request to support Mr. Obama. She said she “doesn’t know” what to do to convince those in her delegation who refuse to support Mr. Obama. “I’m doing everything I can possibly do.”

As the delegates began to filter in to the Pepsi Center on Monday afternoon, the man proudly wearing his Hillary T-shirt was hard to miss. Michael Wagner, a delegate from Washington state, was one of those who fought to ensure Mrs. Clinton’s name would be placed into nomination here.

He said his pro-Clinton stance doesn’t have to mean anti-Obama, but he said he doesn’t think the presumptive Democratic nominee has enough experience.

“I feel that at age 47 you should have some accomplishments to show the work you have been doing,” he said.

A CNN poll released this weekend found that just 66 percent of Democrats who wanted to see Mrs. Clinton as their nominee are backing Mr. Obama, which is down from 75 percent at the end of June. Of the others, 27 percent say they’ll support Mr. McCain, up from 16 percent in June.

Campaigning in Iowa, Mr. Obama said there is ground to make up among some Clinton supporters.

“That’s not surprising,” he said, but he said Mrs. Clinton and her husband can help this week with their own convention speeches.

“I am absolutely convinced that both Hillary Clinton and Bill Clinton understand the stakes. They understand that if we keep on doing the same things that we are doing, which is what John McCain intends, that the American family is going to have a harder time paying the bills,” he said.

Sean Lengell, Christina Bellantoni, Karen Goldberg Goff and Erin Moffet contributed to this article. S.A. Miller reported from the campaign trail with Mr. Obama.