Presidential Hopefuls and Optimal Helpfulness

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Sen. Marco Rubio (R-FL) reacts to U.S. President Barack Obama's announcement about revising policies on U.S.-Cuba relations on December 17, 2014 in Washington, DC.

Mayor de Blasio is holding back on endorsing Hillary Clinton for 2016 because he’s waiting to see a substantial liberal “vision.” Bill Lipton, head of the Working Families Party, and Adam Green, co-founder of the Progressive Change Campaign Committee (PCCC), talk about the decisive issues that will distinguish the candidates. Plus: Marco Rubio announces his presidential bid; participatory budget meetings; a Princeton bioethicist makes the argument for why you should be selectively altruistic; and different types of grand openings happening in New York City.