Students in Chicago and around the country are planning walkouts to mark the 19th anniversary of the deadly mass shooting at Columbine High School ... though school officials note some kids often walk out on 4-20 for other reasons. Speaking of which, Sen. Chuck Schumer (D-NY) says he'll propose legalizing marijuana at the federal level. A new CBS News poll shows support for legalizing it is growing: more than 60% of Americans surveyed say pot should be legal, and even those who disagree support letting states decide.

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