Since losing the bitterly fought Democratic primary battle to Obama, questions remain about how engaged Clinton will be in Obama's general election campaign.
In the past, Obama has said Clinton "would be on anybody's short-list," but there has been little activity between the two former rivals since they appeared together at a campaign rally last month in Unity, N.H., and at subsequent fundraisers.
And Clinton hasn't been a high-profile surrogate for Obama.
The former first lady has appeared preoccupied not with electing Obama but with retiring her own $25 million in campaign debt, sending out an e-mail to supporters this week asking for a $5 donation to her campaign for a chance to dine with her "under the stars."
Clinton, who lost her bid to be the Democratic Party's first woman presidential candidate, won 52 percent of Democratic women voters during the primaries. Obama leads McCain 54 to 39 percent in support from likely women voters, according to the latest ABC News/Washington Post poll.
While some ardent Clinton supporters said they would be angry if another woman were chosen as Obama's vice-presidential candidate, others said they would support whomever Obama chooses -- even another woman.
"If that's going to help him secure the White House, then we need to support him," said Dana Kennedy, 40, a former Clinton supporter who went state-to-state campaigning for Clinton during the primary. "The stakes are way too high not to rally behind the nominee."
ABC News' Gary Langer, Peyton Craighill, Tahman Bradley, Kate McCarthy and Matt Jaffe contributed to this report.