It starts with a candidate in the middle, who has seen her ideas and -- yes -- her plans, bubble into the conversation along with her poll numbers. Sen. Elizabeth Warren gets either the very lucky or very unlucky position of being the highest-polling candidate on the stage Wednesday night. She'll be center stage, alongside former Rep. Beto O'Rourke, with Sens. Cory Booker and Amy Klobuchar and former Housing and Urban Development Secretary Julián Castro among those also looking for breakout moments.

Guest: Julián Castro, former U.S. Secretary of Housing and Urban Development

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* ABOUT JONATHAN KARL: Jonathan Karl is ABC News Chief Washington Correspondent and Chief White House Correspondent, contributing to all ABC News broadcasts. Karl has covered every major beat in Washington, including the White House, Capitol Hill, the Pentagon, and the State Department. Karl covered all the major candidates in the 2016 election, including the first interview with Donald Trump of the 2016 election cycle.

* ABOUT RICK KLEIN: Rick Klein is Political Director of ABC News, leading the network's political coverage and planning, and serves as an on-air political analyst across ABC News platforms. Klein joined ABC News in 2007 from The Boston Globe, where he most recently covered Congress and national politics.

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