Boston Latest; New State Exams; John Liu; Immigration Reform

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One suspect has been killed and another (as of 10am) is on the loose in the Boston marathon bombings. We bring you the latest in rolling coverage. Plus: Third through eighth graders have been taking new state exams this week. WNYC's Beth Fertig takes calls from parents on what they're hearing from their children; NYC Comptroller John Liu on why he's running for mayor; and the situation in North Korea.