In the opinion pages: former U.S. Attorney General Michael Mukasey tells Wall Street Journal readers the larger threat the Tsarnaev brothers could represent. The Washington Post's Fred Hiatt breaks down blue America & red America.
Politico's Manu Raju examines the roles Florida Senator Marco Rubio and Texas Senator Ted Cruz may take in the immigration reform debate, and reveals "the worst secret in D.C.".
Head to nbcnews.com for all the latest updates on the investigation in Boston.