"If we supported her and she supports him -- we support him," said Kevin Hostetler, 23, of Arlington, Texas.
Some were already Obama fans and are just here to witness the end of Clinton's run. But for others, no matter what Clinton says in her concession to her rival, they will never back Obama.
Rosemary Storaska of Stafford, Va., volunteered for Clinton, following the campaign all over Pennsylvania. Citing what she sees as Obama's severe lack of experience, she said she will vote for John McCain.
"I worked on her campaign since Thanksgiving. ... That is the one place we won't follow her."
Dee Sawyers made sure she was first in line to hear Clinton's speech Saturday.
"I think we'll look back at this race and see what was truly historic about it," she said.
Sawyers said even though Clinton isn't making it all the way to the White House, her 25-year-old daughter and a generation of young women have been shown that it is possible for a woman to make it in politics.
"It's not for the faint of heart," she said.
Clinton hosted a big bash for her staff Friday at the Clintons' home in Washington.
"There's no booze! I'll fix that," joked Terry McAuliffe, Clinton's campaign chairman.
Inside, Clinton thanked her dedicated staff for putting their lives on hold. Former President Bill Clinton and daugther Chelsea Clinton were at her side but did not speak Saturday.
"My mother wants it to be very clear that we are all going to unite our party and take back the White House in November!" Chelsea Clinton told Democrats at a prescheduled Democratic party fundraiser Friday night.
At a secret, one-hour meeting at the home of Clinton supporter Sen. Dianne Feinstein, D-Calif., Thursday night, Clinton and Obama sat down face-to-face for the first time since the end of the nomination contest.
The rivals agreed it's not helpful to have Clinton supporters pushing Obama to make her the vice presidential running mate.
"I saw Bill go through this. And I know this has to be your decision," Democratic sources said Clinton told Obama.
The meeting, Feinstein says, was a good first step toward brining the Democrats back together.
No matter how civil, how courteous you tend to believe your opponent, in a campaign, you get rubbed a little raw, its hard, you need some recovery for those raw spots," Feinstein said.
For her part, Clinton asked her supporters to look forward, not backward.
"Every moment wasted looking back keeps us from going forward," said Clinton. "Life is too short, life is too precious, and the stakes are too high to dwell on what might have been. … I will work my heart out to make sure Barack Obama is our next president.
ABC News' Jennifer Parker and Ed O'Keefe contributed to this report.