If there was any remaining doubt about where Hillary Clinton stands in this year's presidential election, one line of her speech Tuesday night was meant to put that doubt to rest.

"Barack Obama is my candidate," she told the delegates to the Democratic National Convention in Denver, Colorado. "And he must be our president."

With that, Senator Clinton told her supporters she expected them to get behind Obama and vote for him in November even if they're still angry she lost her bid for the Democratic presidential nomination.

"Were you in this campaign just for me?" she asked her supporters Tuesday night. "Or were you in it for all the people in this country who feel invisible?"

Senator Clinton listed some of those "invisible" people in her speech.

"I will always remember the single mom who had adopted two kids with autism. She didn't have any health insurance," Clinton said. "She asked me to fight for health care for her and her children.

"I will always remember the young man in a Marine Corps T-shirt who waited months for medical care," she continued. "He said to me, 'Take care of my buddies. A lot of them are still (overseas). And then, will you please take care of me?

"And I will always remember the young boy who told me his mom worked for the minimum wage (and) that her employer had just cut her hours," she said. "He said he didn't know what his family was going to do.

"When Barack Obama is in the White House, he'll revitalize our economy, defend the working people of America and meet the global challenges of our times," Senator Clinton said.

The McCain campaign disagrees with that.

It has released a new ad that claims Obama doesn't understand how dangerous Iran is.

And even though Senator Clinton made it clear she wants voters to support Obama, the Republicans are still using her words against him specifically, her repeated claims during the Democratic primaries that Obama is not ready to be president.

"Nowhere in (her) speech did she answer the question about his character, his ability to lead, the things that are at issue here," said former Republican presidential candidate Rudolph Giuliani, in an interview on CBS' "Early Show" Wednesday. "And until she does, you're going to have a lot of Hillary Clinton supporters that are either not going to vote or are going to vote for John McCain."

Not if Senator Clinton gets her way.

"You haven't worked so hard over the last 18 months, or endured the last eight years, to suffer through more failed leadership," she said, linking McCain to President Bush. "No way, no how, no McCain."