Criticism of his wife, Michelle Obama.

In an interview with Glamour magazine, Obama said attacks on his wife are "infuriating." The likely Democratic presidential nominee blamed the conservative press for going after his wife as if she were the candidate.

"If they have a difference with me on policy, they should debate me. Not her," Obama told the magazine.

An Associated Press-Yahoo poll suggests Michelle Obama has higher favorable ratings than Cindy McCain, wife of presumptive Republican nominee John McCain. However, Michelle Obama's unfavorable ratings are also higher.

Michelle Obama came under fire in February when she said she was proud of her country for the first time in her adult life. She later clarified her remark, saying she has always been proud of her country and was particularly proud to see so many people involved in the political process.

Obama said the attacks are ironic because his wife is "the most quintessentially American woman I know."

Michelle Obama, 44, has worked as a lawyer and hospital executive. The couple has two daughters, Malia, 10, and Sasha, 7.

The Internet has been a double-edged sword for the Obama campaign. While it's allowed them to organise supporters and raise millions of dollars, Obama said it's also provided a vehicle for rumours and myths to spread quickly.