Thursday, January 2, 2020: Julián Castro Ends His 2020 Presidential Bid

Calling it quits. Julian Castro tells his supporters to keep fighting, as he officially ends his bid to become president. And the proxy battle playing out between Washington and Tehran is far from over after a violent attack on the U.S. Embassy in Baghdad. Plus, Bernie Sanders is feeling flush after netting nearly $35 million in three months from grassroots donors. On today's panel: Margaret Talev with Axios, Olivier Knox with Sirius XM, Sahil Kapur with Bloomberg, and Rachael Bade with The Washington Post. Also on today's program: CNN's Ryan Nobles and Arwa Damon.

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