MANCHESTER, NH - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) wave while departing Obama's campaign plane June 27, 2008 in Manchester, New Hampshire. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
EN ROUTE TO MANCHESTER, NH - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) talk on board Obama's campaign plane June 27, 2008 en route to Manchester, New Hampshire. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
US Democratic presidential candidate Illinois Senator Barack Obama (2ndR)and former candidate New York Senator Hillary Clinton (C) greet supporters at rally in Unity, New Hampshire, on June 27, 2008. Obama said Friday that he, the Democrats and the American people need both Hillary and Bill Clinton on board to change the nation. AFP PHOTO/Emmanuel Dunand.
WASHINGTON - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) wave while boarding Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
WASHINGTON - JUNE 27: WASHINGTON, DC- JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) prepare to board Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
WASHINGTON - JUNE 27: WASHINGTON, DC- JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) prepare to board Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
WASHINGTON - JUNE 27: WASHINGTON, DC- JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) prepare to board Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
WASHINGTON - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) kiss before boarding Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
WASHINGTON - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) kiss before boarding Obama's campaign plane at Reagan National Airport June 27, 2008 in Washington, DC. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
EN ROUTE TO MANCHESTER, NH - JUNE 27: Democratic presidential candidate Sen. Barack Obama (D-IL) and Sen. Hillary Rodham Clinton (D-NY) talk on board Obama's campaign plane June 27, 2008 en route to Manchester, New Hampshire. Obama and Clinton will appear together at a campaign event in Unity, New Hampshire today. The former presidential rivals are appearing together in a show of unity for Obama's presidential campaign.
UNITY, NH - JUNE 27: U.S. Sen. Hillary Rodham Clinton (D-NY) leaves after campaigning for the first time with fellow Democratic Senator Barack Obama June 27, 2008 in Unity, New Hampshire. After an acrimonious primary, the two politicians look to set aside differences and unify the Democratic Party before the November election.
WASHINGTON - JUNE 25: U.S. Speaker of the House Rep. Nancy Pelosi (D-CA) (L) and Sen. Hillary Clinton (D-NY) (R) leave after they spoke to the media June 25, 2008 on Capitol Hill in Washington, DC. Clinton joined the House Democratic leaders to speak to the media after she spoke to a closed House Democratic Caucus meeting.
WASHINGTON - JUNE 25: U.S. Speaker of the House Rep. Nancy Pelosi (D-CA) (L) and Sen. Hillary Clinton (D-NY) (R) leave after they spoke to the media June 25, 2008 on Capitol Hill in Washington, DC. Clinton joined the House Democratic leaders to speak to the media after she spoke to a closed House Democratic Caucus meeting.
WASHINGTON - JUNE 25: U.S. Speaker of the House Rep. Nancy Pelosi (D-CA) (R) shakes hand with Sen. Hillary Clinton (D-NY) (L) June 25, 2008 on Capitol Hill in Washington, DC. Clinton joined the House Democratic leaders to speak to the media after she spoke to a closed House Democratic Caucus meeting.
WASHINGTON - JUNE 25: U.S. Speaker of the House Rep. Nancy Pelosi (D-CA) (R) speaks as Sen. Hillary Clinton (D-NY) (L) looks on June 25, 2008 on Capitol Hill in Washington, DC. Clinton joined the House Democratic leaders to speak to the media after she spoke to a closed House Democratic Caucus meeting.
US Senator Hillary Clinton(L) ,D-NY, greets supporters and staffers as she arrives for work at the US Captiol on June 24, 2008 in Washington, DC. Clinton returned to political life Tuesday with her first appearance in Congress since losing the Democratic White House race to Barack Obama three weeks ago.
WASHINGTON - JUNE 07: Chelsea Clinton (C) and her father, former U.S. President Bill Clinton (L) look on as U.S. Sen. Hillary Rodham Clinton (D-NY) greets supporters at the National Building Museum June 7, 2008 in Washington, DC. Clinton thanked her supporters for standing behind her in one of the longest Democratic primary seasons in history and urged them to back Sen. Barack Obama (D-IL) to be the next president of the United States.