SAN FRANCISCO - JULY 31: Senator Hillary Rodham Clinton (D-N.Y.) greets supporters after she spoke to members of the American Federation of State, County and Municipal Employees (AFSCME) at the Moscone Center July 31, 2008 in San Francisco, California. The AFSCME held their bi-annual meeting to elect their international vice presidents, amend resolutions and to confirm their endorsement for Democratic Presidential Nominee Barack Obama.
SAN FRANCISCO - JULY 31: Senator Hillary Rodham Clinton (D-N.Y.) speaks to members of the American Federation of State, County and Municipal Employees (AFSCME) at the Moscone Center July 31, 2008 in San Francisco, California. The AFSCME held their bi-annual meeting to elect their international vice presidents, amend resolutions and to confirm their endorsement for Democratic Presidential Nominee Barack Obama.
SAN FRANCISCO - JULY 31: Senator Hillary Rodham Clinton (D-N.Y.) speaks to members of the American Federation of State, County and Municipal Employees (AFSCME) at the Moscone Center July 31, 2008 in San Francisco, California. The AFSCME held their bi-annual meeting to elect their international vice presidents, amend resolutions and to confirm their endorsement for Democratic Presidential Nominee Barack Obama.
SAN FRANCISCO - JULY 31: Senator Hillary Rodham Clinton (D-N.Y.) speaks to members of the American Federation of State, County and Municipal Employees (AFSCME) at the Moscone Center July 31, 2008 in San Francisco, California. The AFSCME held their bi-annual meeting to elect their international vice presidents, amend resolutions and to confirm their endorsement for Democratic Presidential Nominee Barack Obama.
Senator Hillary Clinton (L) is pictured alongside U.S. President George W. Bush (seated) after Bush signed H.R. 3403, the New and Emerging Technologies 911 Improvement act of 2008, in the Oval Office of the White House in Washington, July 23, 2008. At right is Illinois Republican Congressman John Shimkus.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) embraces Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) and Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) attend a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) waves as he and his former rival Sen. Hillary Rodham Clinton (D-NY) attend a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) speaks as Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) looks on at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) greets Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) as he takes to the stage at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) speaks as his former rival Sen. Hillary Rodham Clinton (D-NY) looks on at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) speaks as his former rival Sen. Hillary Rodham Clinton (D-NY) looks on at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) waves as he and his former rival Sen. Hillary Rodham Clinton (D-NY) attend a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) and his former rival Sen. Hillary Rodham Clinton (D-NY) attend a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) speaks as Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) looks on at a joint Democratic Party fundraising event at the New York Hilton hotel July 10, 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.
NEW YORK - JULY 10: Sen. Hillary Rodham Clinton (D-NY) speaks at a joint Democratic Party fundraising event with Presumptive Democratic presidential candidate Sen. Barack Obama (D-IL) at the New York Hilton hotel July, 10 2008 in New York City. Speculation continues over Obama's possible choice of Clinton as a vice presidential running mate.