Presidential candidate Rep. Tim Ryan Timothy (Tim) RyanNow's the time to make 'Social Emotional Learning' a national priority Mourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' MORE (D-Ohio) is selling “You Don’t Have to Yell” bumper stickers after making the same admonition to Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) in Tuesday’s Democratic primary debate.

If we truly care about lifting up every voice and fighting on behalf of the issues that keep Americans up at night, let’s start by making our conversations civil and productive. #YouDontHaveToYell pic.twitter.com/OLsP1qeSze — Tim Ryan (@TimRyan) July 31, 2019

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Sanders and Ryan’s combative exchange was among the debate’s viral moments, with Sanders defending his “Medicare for All” proposal and Ryan responding that the Vermont senator “[didn’t] know that” he could guarantee all the claims he made about them.

“I do know that, I wrote the damn bill,” Sanders responded, a rejoinder that his own campaign put on bumper stickers after the exchange spread on social media.

The second debate was marked by showdowns between members of the party’s progressive and centrist wings about the need for dramatic policy overhauls, with Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) and former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) having a similar standoff.