Obama also tried to head off any inroads McCain might make among women voters by arguing on GMA that "on almost every single issue that's important to women, he [McCain] has been on the wrong side."
"You know, he's in favor of judges who would overturn Roe v. Wade. He has opposed equal pay," Obama said, and charged that McCain also fought a program to insure children and to protect women from discrimination.
Women, particularly married white women, however, may be a problem for Obama, according to the Washington Post/ABC poll.
It showed that McCain has a 20 point advantage over Obama among married white women, a group that George Bush also won in the last two presidential elections.
Stephanopoulos told GMA that the figure was a "danger sign" for Obama. "This is a huge gap that Obama has to close if he's going to do well."
Obama faces an additional problem that only half of the voters saying he has the necessary experience to be president.
"If you look at the key question of experience, that may be what's holding him back," Stephanopoulos said. "Only 50 percent of voters say that Barack Obama has the experience to be president. A full 46 percent say, no, he doesn't have the experience . . . That's one of the reasons they are going on the foreign trips."
Obama has talked publicly about going to Iraq, but ABC News has learned that he is adding Afghanistan to his travel itinerary.
The crucial political battle appears to be shaping up around independent voters between the age of 30 and 64.
"Those middle of the road independent voters, they are breaking right down the middle," Stephanopoulos said. "This is going to be a key battleground for both campaigns going into November."
While Obama runs well among younger voters, they are not always reliable when it comes to showing up at the polls. Meanwhile, he is 12 points behind McCain among the more reliable older voters.
In addition, nearly a quarter of Clinton's voters are holding back on their support, according to the ABC News/Washington Post poll.
"If that number stays that high, it will be difficult for Barack Obama to win," Stephanopoulos said.
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