It is the Illinois senator's second trip to Iraq, after a visit in 2006.
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Pivotal blue-collar Reagan Democrats have been reluctant to embrace the Illinois senator's message of change.
The Illinois senator also voted to authorize construction of a 700-mile fence along the U.S.-Mexican border.
Obama's campaign announced four new superdelegates for the Illinois senator on Wednesday, compared with one for Clinton.
The Illinois senator offered a similar line of attack on foreign policy, energy policy and health care.
The new poll indicates the Illinois senator holds a four-point edge over McCain, 51 percent to 47 percent.
The Illinois senator says taking money from the highway fund would have negative economic effects, especially for Pennsylvanians.
Barack Obama's campaign wasn't behind the video, but the buzz probably didn't hurt the Illinois senator's presidential bid.
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But it appears the Illinois senator is at least considering such a measure.
The Illinois senator has a shot at winning a state in the South.
Looking back, the Illinois senator with the illuminated smile had it pretty good.
Barack Obama and is encouraging fellow Democrats to "heal the rift in our party" and unite behind the Illinois senator.
Top Democrats from Clinton's home state of New York plan to endorse the Illinois senator, congressional staffers and Obama campaign insiders said.
Edward Kennedy on Monday endorsed Barack Obama for the Democratic presidential nomination, saying the Illinois senator is a man with both leadership and character.
But the poll suggests Wright certainly doesn't help the Illinois senator.
Other key issues for the Illinois senator include a revamped energy policy focusing on increased efficiency and alternate technologies, and expanded health care coverage for all Americans.
Saturday, two days before the start of the Democratic National Convention, the Illinois senator was scheduled to give his first stump speech with his new running mate.
Greg Craig, a former State Department official under President Clinton and a longtime Obama supporter is reportedly playing the role of McCain in the Illinois senator's debate practices.
In addition to the Illinois senator's considerable money advantage, each state has undergone significant demographic shifts over the last two decades that have made Democrats steadily more competitive.
High-profile, openly gay figures such as musician Melissa Etheridge and DreamWorks SKG mogul David Geffen joined a grassroots army of supporters at campaign rallies for the Illinois senator.
Biden's comments have also become a fixture of both McCain and Palin's stump speeches as they look to stress what they call the Illinois senator's relative lack of foreign policy experience.
During a later stop at the Senate to vote on the budget, the Illinois senator confirmed reports that he and Clinton had run into each other backstage at the AIPAC conference.
With Obama's wins Saturday in Louisiana, Nebraska, Washington and the Virgin Islands, and his projected victory in Maine, the Illinois senator took the pledged-delegate lead over Clinton -- 986-924, according to CNN calculations.
With most U.S. precincts tallied, the popular vote was 51.9% for Obama and 46.8% for McCain, making the Illinois senator the first Democrat to win a majority of the popular vote since 1976.
After all, just five days earlier the Illinois senator had beaten John Edwards and Hillary Clinton into second and third place - and the latest polls suggested he was about to repeat the feat.
The McCain campaign, meanwhile, is trying to capitalize on that, telling voters Obama cannot be trusted, recently running an ad mocking Obama's celebrity status while comparing the Illinois senator to Paris Hilton and Britney Spears.
Obama also has a slight lead over McCain when it comes to who is considered a stronger leader, an advantage that McCain had long held over the Illinois senator and one that has been a chief talking point of his campaign.
CNN: Most believe McCain's attacks on Obama unfair, poll finds
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