Summary: The Senate voted to begin debating legislation to curb gun violence. Also, Obama’s $3.8 trillion budget plan that rankled both Republicans and Democrats. Plus, the political calculation behind the president’s outreach to conservatives. Joining Gwen: Ed O’Keefe, Washington Post; John Harwood CNBC and New York Times; John Dickerson, Slate Magazine; Alexis Simendinger, Real Clear Politics
