The Emmy Award-winning "CBS News Sunday Morning" is broadcast on CBS Sundays beginning at 9:00 a.m. ET. "Sunday Morning" also streams on the CBS News app beginning at 12:00 p.m. ET. (Download it here.) Hosted by Jane Pauley COVER STORY: Building bridges across the American divide U.S. high school seniors who participate in the American Exchange Project (or AEP) are sent on a free, week-long trip to a hometown very different from their own. Correspondent Lee Cowan talks with AEP's co-founder, David McCullough III, and with students who have crossed the boundaries of blue states and red states to find...