Today on Cronkite NewsWatch, after another suspicious letter was intercepted while en route to a United States senator and President Obama, our nation's capital and the Arizona capital is on high alert. We'll have a special report from our Washington, D.C. Bureau on what security precautions are being taken after the latest scare. Plus, the Senate voted and rejected the bipartisan plan to expand background checks, we look into what that means for the future of the gun control effort. And, the gang of 8 senators, two of which are from Arizona, officially submitted their much anticipated bipartisan immigration bill- we look into the specifics of the bill.

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