Debate Season: Sanders vs. Warren Preview, No More Mr. Nice Biden; Trump's Latest Racist Tweets; GOP Hypocrisy; YouTube's Minor Millionaires

A former senior strategist from the Bernie Sanders 2016 campaign discusses whether or not Sanders and Warren will spar with each other at next week's CNN debate, and whether they need to differentiate themselves; Elizabeth Warren embraces progressive proposals to rally voters-will it work?; Biden takes off the gloves and targets his rivals ahead of Debate 2; Trump takes to Twitter to attack a minority lawmaker (again), this time insulting Rep. Cummings and calling Baltimore a "disgusting, rat and rodent infested mess": CNN's Victor Blackwell is from Baltimore & joins SE to discuss his reaction; Republicans are suddenly in favor of all kinds of things they once weren't-Mark Sanford, who is considering a primary run against Trump, joins SE to discuss; YouTube gives "child stars" a new meaning.

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