ABC News' Jennifer Parker reports: A longtime friend of Sen. Hillary Clinton said it's "incomprehensible" that Sen. Barack Obama would choose another woman to be his vice-presidential candidate over Sen. Hillary Clinton.
"The selection of either one of those instead of Sen. Clinton I would find completely incomprehensible," said Lanny Davis of rumored Obama vice-presidential contenders Kansas Gov. Kathleen Sebelius and Missouri Sen. Claire McCaskill.
Davis is a former special counsel to President Bill Clinton and a longtime friend of Sen. Hillary Clinton's dating back to their time at Yale Law School.
"If anyone thinks that picking a woman will simply placate Hillary Clinton's female supporters, I think that's very patronizing to women and i don't think that that either Gov. Sebelius or Sen. McCaskill would disagree," said Davis, who penned an op-ed in the Wall Street Journal Thursday titled "Why Obama Should Pick Hillary."
Davis said he hasn't met either Sebelius or McCaskill and said he admires them, but Clinton is more qualified.
"She helps him more and she's more qualified," Davis said of Clinton, "Therefore, why would he pick two females, both who are very admirable public servants, why would you pick them over her?"
Davis, a longtime friend of Clinton, said he isn't speaking for Clinton and doesn't know if she truly wants to be vice-president. Though Davis said she recently called him when he was ill.
Davis said he hasn't given up on the "dream" of an Obama-Clinton ticket, though he said he has abandoned his early effort after Obama won the primary to get Clinton supporters to sign a petition urging Obama to pick Clinton as his running-mate.
However other Clinton supporters seem less confident in an Obama-Clinton ticket.
Two former Clinton campaign staffers who started the website VoteBoth.com to urge Obama to choose Clinton as his running-mate is shutting down under the assumption she's not on his short-list of vice-presidential candidates.
Obama's vice-presidential shortlist is being closely help by the campaign.
"We're not commenting about the nominee selection process," Obama spokesperson Bill Burton told ABC News.com.
Likely Democratic vice-presidential contenders include Virginia Gov. Tim Kaine, Indiana Sen. Even Bayh, Sen. Joe Biden, New Mexico Gov. Bill Richardson, and Sebelius, a two-term governor of a red state, and McCaskill, a first-time senator from a battleground state who is close to Obama.
McCaskill campaigned with Obama in Missouri Wednesday, but she has said she's not being vetted and sources close to her describe her role as a close personal advisor rather than a possible veep candidate. Meanwhile, Sebelius sidestepped questions Wednesday about whether she is being considered.
Obama may try to solidify his support among women voters thought key in November by picking a woman as his running-mate.
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. However Obama is leading McCain 54-39 percent in support from likely women voters, according to the latest ABC News poll.
But Davis argued Obama's poll numbers increase with Clinton as his running-mate, citing two June polls from Wall Street Journal/NBC and Fox/Opinion Dynamics. "Even they wouldn't contend, I believe, that they would be more helpful to Sen. Obama on the ticket than Hillary Clinton," Davis said of Sebelius and McCaskill.
ABC News' Matt Jaffe contributed to this report.