Michelle Obama, wife of Barack Obama, waves to the crowd with her daughters Malia (R) and Sasha during the Democratic National Convention in Denver, Monday, Aug. 25, 2008.

DENVER, the United States, Aug. 25 (Xinhua) -- Hillary Rodham Clinton's name was mentioned in the headline speech Michelle Obama delivered to the Democratic National Convention on Monday night.

"People like Hillary Clinton, who put those 18 million cracks in the glass ceiling, so that our daughters and sons can dream a little bigger and aim a little higher," said the wife of the presumptive presidential candidate, Barack Obama, followed by applause.

It was considered as another move of Obama's campaign to seek reconciliation with Clinton's voters who are still hesitating to accept him as the presidential candidate.

The former First Lady lost the primary to Obama despite the 18 million votes she has won. After dropping out of the race on June 7, she has vowed to try all to send Obama to the White House and appeared with her former rival in several campaign and fundraising activities.

However, recent national polls showed there were still over 25 percent of Clinton's supporters saying that they would vote for McCain in November and about 20 percent of them remaining undecided.

Obama's selection of Joe Biden as his running mate not Clinton, who used to be most hopeful vice presidential candidate, stirred more concern about the party's split.

"It is a concern of media, not Obama's campaign," said Gregory B. Craig at a Monday press conference. "The party will be united."

Clinton is set to deliver the headline prime-time speaker on Tuesday night at the convention, an arrangement to honor her achievement as a female candidate who has done excellently in the primary.

Her husband, former President Bill Clinton, will also address the convention on Wednesday night.