President Obama speaks about his gun control agenda before law enforcement officials in Minneapolis on Monday. The president was doing what his aides say he didn't do often enough in his first term: getting outside of Washington to build public support for legislation. Ben Garvin/Getty Images hide caption

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President Obama, accompanied by Vice President Joe Biden, talks at the White House on Jan. 16 about proposals to reduce gun violence. Obama has called for a ban on military-style assault weapons and high-capacity ammunition magazines and is pushing other policies in the wake of the mass shooting last month at an elementary school in Newtown, Conn. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Senate Judiciary Committee Chairman Patrick Leahy, D-Vt., voted to allow guns in national parks and on Amtrak trains, but rejects suggestions that he'll slow-walk gun control efforts through Congress. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images