McCain, Clinton and Obama questioned Petraeus and Crocker during their appearance before the Senate Armed Services Committee on Tuesday.
CNN: Iraq hearings highlight differences between McCain, Democrats
Obama keenly questioned Graf about how they were raising their children, how the children understood their racial identity.
President Barack Obama was questioned about whether he agreed with Mr Crowley's comments at a news conference on Friday.
Before his trip, critics questioned whether Obama should leave the country to make his pitch, given his already full plate.
But it should be pointed out that more than 80 percent of the respondents were questioned before Obama's rout of Clinton and Edwards in Saturday's South Carolina primary.
President Barack Obama, who has already questioned the wisdom of Netahyahu's policies and how well they serve the Israeli national interest, might take a more assertive approach to Israeli policies which he believes also hinder U.S. national interest in the region.
Obama's remarks are being questioned by Senate Republicans, whose campaign arm is paying for a Web ad asking whether it is appropriate for the president to say Cambridge police acted stupidly.
In late 2006 and early 2007, when the Bush administration put the finishing touches on the strategy that would become the Iraq surge, Obama and many of his top aides questioned its wisdom.
According to Marta Lagos, executive director of opinion poll organisation Latinobarometro, anger over the accord is being directed at Mr Pinera rather than Mr Obama, particularly because the Chilean leader has questioned the wisdom of developing nuclear energy in the past.
Two out of three people questioned in the poll approve of the way Obama is handling his job as president.
CNN: Poll: Most favor bipartisanship; Democrats, not so much
And Obama, a member of the Foreign Relations Committee, questioned whether the conditions set by U.S. commanders for withdrawal would lead to a war that could last 20 to 30 years.
CNN: Petraeus, Crocker criticize Iran, call for halt to troop pullout
Barack Obama, a member of the Foreign Relations Committee, questioned whether the conditions set by U.S. commanders for withdrawal would lead to a war that could last 20 to 30 years.
CNN: Iraq hearings highlight differences between McCain, Democrats
Obama and Health and Human Services Secretary Kathleen Sebelius have also questioned whether there's enough data available to show the morning-after pill is safe and appropriate for younger girls, even though physicians groups insist that it is.
Yet the Republican National Committee and Romney, a mechanical campaigner whose ability to inspire passion in the Republican base was widely questioned during the primaries, hold a huge cash advantage over Obama.
"This isn't going to change the trajectory of the result, " Fleischer said, noting that 24% of those questioned said the debate made them more likely to vote for Obama while 25% said it nudged them toward Romney, and 50% said they were not influence either way.
CNN: Campaign enters final stretch as Obama takes final debate
When questioned whether she could have been seen as an agent of change instead of Obama, she replied that she was not the lead on the ticket, in a slight jab to US Senator John McCain.
Obama now leads Romney by seven percentage points in the poll with 52% of registered voters questioned in the survey saying that they'd vote to re-elect the president and 45% backing Romney.
Questioned by reporters, White House spokesman Jay Carney said he did not think President Barack Obama had a response to the issue.
CNN: TSA chief faces critics, says new knife policy will stand
While the Obama campaign ad seeks to demonize Bain Capital and its founder Mitt Romney, many, including Democrats, have questioned the propriety of this frontal attack on capitalism and private equity.
The Obama campaign has accused the group of "Swift Boat tactics", recalling a highly effective ad from 2004 which questioned John Kerry's Vietnam record.
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