London, May 4 : US Presidential candidate Barack Obama is struggling to contain his anger and frustration over the constant barrage of questions about his character and judgment, his wife has revealed.

Michelle Obama spilled the beans on the irritation felt by the leading Democrat candidate for the White House at the way anti-American outbursts by his pastor, Jeremiah Wright, have dogged his campaign.

He is said to be itching to turn all his fire on John McCain, the Republican candidate, who is benefiting most from Obama's protracted tussle with Hillary Clinton.

Michelle, in a rally in Durham, North Carolina held on May 2, said that her husband's only desire was to change US politics had helped him to control his feelings.

"Barack is always thinking three steps ahead – what do we need to do to make change,” the Telegraph quoted her, as telling.

Her husband was thinking "I can't let my ego, my anger, my frustration get in the way of the ultimate goal," she said.

"Barack has been characterised as many things that have nothing to do with who he is,” Michelle added. (ANI)