John McCain, the presumptive Republican nominee and Obama's rival in the general election.
John McCain, Mr Obama's rival for the presidency, wants to suspend America's relatively paltry tax on petrol, to secure lower prices for angry drivers.
Obama congratulated his rival John McCain and praised McCain's service to the country as a politician and Navy pilot and prisoner of war in Vietnam.
Joe Lieberman endorse Republican nominee John McCain Tuesday night, down 17% from the second night of the DNC, when Obama's rival-turned-supporter Hillary Clinton took the stage.
As American voters prepare to choose between Barack Obama and Republican rival Mitt Romney, Afghans fear that the silence over this war during the campaign means it has been relegated further down in U.S. foreign policy priorities.
CNN: Obama, Romney: Ignore Afghanistan war at your own peril
The rift came to head during last year's U.S. presidential campaign when some U.S. officials were offended by what they saw as efforts by Mr. Netanyahu and his supporters to spotlight the prime minister's warm ties to Mr. Obama's rival, Republican presidential candidate Mitt Romney.
Obama neutralizes a potential rival for the 2012 race. iReport.com: Clinton 'too independent' for Obama cabinet?
CNN: Commentary: Clinton pick would be brilliant, but risky, move
It was a risk for Barack Obama to bring his rival into the administration's tent.
But shortly after the call ended, Obama said, his rival appeared on television announcing the suspension and the subsequent debate no-show.
During the 2008 presidential campaign, Clinton and rival Barack Obama both backed civil unions for gay couples, but not same-sex marriage.
Early in his 2007 bid for the presidency, Biden found himself apologizing to rival Barack Obama after a remark some found racially insensitive.
This is so pathetic that Obama has only one rival in the modern history of the presidency on this score: Herbert Hoover, who was also negative.
FORBES: Obama Has Had Plenty of Time, But Gave Us -0.3% Growth Instead
Reacting earlier to Edwards' plans, Obama praised his former rival.
Both Mr Obama and his Republican rival, John McCain, say that they will pay more heed to allies who have felt snubbed these past seven years by George Bush.
President Barack Obama and his Republican rival, Mitt Romney, are in the midst of three presidential debates that look likely to decide the election and the future of the country.
FORBES: Should You Discuss The Presidential Debates At Work?
Hillary Clinton, Obama's main rival for the Democratic nomination.
John McCain, the presumptive Republican presidential nominee and a supporter of offshore drilling, has ridiculed Barack Obama, his Democratic rival, for suggesting that Americans should try to conserve fuel by keeping their tyres fully inflated.
ECONOMIST: Finding more oil has become the first issue of the campaign
Nearly two-thirds of those surveyed, 62 percent, believe that the Republican presidential nominee would be the better candidate to handle the issue of terrorism, compared with 34 percent who believe that his Democratic rival, Obama, would be better on the issue.
Vilsack, who dropped out of the presidential race in February 2007, is the fourth former presidential rival to join Obama's team.
Obama tried to paint his rival as an extension of George W. Bush, while McCain sought to portray the Democrat as a tax-and-spend liberal.
Presidential hopeful Hillary Clinton has accused her rival, Barack Obama, of distorting her views about health care and trade in flyers he mailed to voters.
Earlier in the day, Mrs Clinton officially tendered her resignation to President Barack Obama, her former bitter rival in the 2008 race for the Democratic presidential nomination.
Hillary Clinton has been leading the polls in the race for the Democratic presidential nomination, but her rival, Barack Obama, has released numbers showing that he's outfundraising her.
President George W. Bush has pledged full cooperation with Obama, who beat Republican rival John McCain to become America's first African-American president, ahead of his inauguration on January 20.
Obama has routinely criticized his GOP rival for being a Washington insider.
Former presidential candidate Hillary Clinton visited Florida on Monday to stump for her onetime rival, Democratic presidential nominee Barack Obama.
Former rival Clinton hit the trail for Obama on Monday, focusing on the economy as she campaigned in the toss-up state of Florida.
Barack Obama has asked top contributors to help former rival Sen.
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