Minneapolis Democrat Rep. Keith Ellison went on MSNBC's "The Ed Show" over the weekend to talk about what it will take to put an end to mass killings and gun violence of the kind that occurred in Newtown, Connecticut on Friday. Noting that some in Congress are already working to introduce stricter gun controls, Ellison calls for pressure at all levels — from the White House down — to stand up the gun lobby and get the laws passed. He also talks about the necessity of a cultural shift around guns.