The latest on the Boston bombing investigation including the arrest of Dzokhar Tsarnaev’s three friends. Also, President Obama renews his commitment to close Guantanamo Bay. Plus, Obama's second-term agenda is being tested by unexpected events. Joining Gwen: Pete Williams, NBC News; Michael Duffy, TIME; Doyle McManus, Los Angeles Times; and Christi Parson of Tribune.
In the Webcast Extra, NBC’s Pete Williams shares his experience covering the Boston Marathon bombing. Also, President Obama may have a “red line” for intervention in Syria, but the line is fluid. And in Mexico, President Obama pushes for immigration reform.