The Big Question: Does Elizabeth Warren have a ceiling, or can she convince Democrats she’s 'The One?'

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A new NBC News/Wall Street Journal poll shows good news for two of the 2020 contenders. Joe Biden remains in the lead, but Elizabeth Warren is gaining on him. Warren has the backing of women with college degrees and more liberal Democrats, and she gets the most second-choice support in the poll. Warren is consistently rising in the polls, but does she have a ceiling? Or can she convince the majority of Democratic voters that she is the one?