EXCLUSIVE: George Stephanopoulos Interviews Presidential Hopeful Barack Obama

In the 13 weeks since he kicked off his bid for the presidency on the steps of the Old State Capitol in Springfield, Ill., Sen. Barack Obama, D-Ill., has traveled from New Hampshire to Iowa, from South Carolina to Nevada, and to many points in between. He's been to the Clyburn Fish Fry in South Carolina, and the anniversary of the civil rights march in Selma, Ala.

But he hasn't sat down for a Sunday morning interview -- until now.

This Sunday, in an exclusive interview, George Stephanopoulos puts the tough questions to Obama: Why does this first-term senator think he has what it takes to be president? What will he do to get us out of Iraq, to make healthcare universal, and to stop global warming?

With recent speeches on foreign policy and energy, Obama has begun to lay out his policy agenda.

In this extensive and in-depth interview, Stephanopoulos will press Obama for more specifics about his vision for the country, and his promise to run a "different" kind of campaign.