NOW With Alex Wagner 04/23/13

Will Boston attacks serve as new model for 21st century terrorism?

Police have learned of a possible motive in the Boston Marathon bombing, and MSNBC's Karen Finney, the New York Times' Frank Bruni, fmr. U.S. Army vet Wes Moore, Mother Jones' David Corn and NBC News' Pete Williams discuss. ... more Duration: {{video.duration.momentjs}}