UPDATE 6:00 p.m.: Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE responded to Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE's list of challenges to his committment to progressive causes with an even longer list of challenges to Clinton's claim that she is a true progressive.

Original story:

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Democratic presidential front-runner Hillary Clinton on Wednesday responded to her rival Sen. Bernie Sanders (I-Vt.) calling into question her progressive bona fides with a tweetstorm of her own.

1) This shouldn't be a debate about who gets to define "progressive"—it should be about who will get real results for American families. — Hillary Clinton (@HillaryClinton) February 3, 2016

2) Now, if you do want to make it about who's a "real progressive," @BernieSanders, what were you on these days? pic.twitter.com/8Q6hANYPhh — Hillary Clinton (@HillaryClinton) February 3, 2016

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3) An important part of being a progressive is making progress. From health care to fighting inequality, Hillary's record speaks for itself. — Hillary Clinton (@HillaryClinton) February 3, 2016

4) Hillary's not running to make a point—she's running to make a difference. She'll keep doing that. Please feel free to keep tweeting. — Hillary Clinton (@HillaryClinton) February 3, 2016

Earlier in the day, Sanders had tweeted out a video of him talking to reporters and being asked whether he thinks Clinton is a real progressive.

"Some days, yes," he responds. "Except when she announces that she is a proud moderate, and then I guess she is not a progressive."

He followed that up with a chain of tweets calling Clinton out for positions she held in the past that have run counter to progressive ideals.

The social media feud came hours before the two are scheduled to appear at a CNN town Hall in Derry, N.H. Their campaigns have agreed to three new ones, all of which will be sanctioned by the Democratic National Committee.

Clinton has been trying to cut into Sanders's substantial lead in New Hampshire polling after his surprisingly strong performance in Iowa this week.