Social Pro Daily Julián Castro’s Comment on Police Violence Was the Top-Tweeted Debate Moment Joe Biden was the most-discussed Democratic presidential candidate Tuesday nightBy David Cohen|October 16, 2019 President Donald Trump was the most-tweeted-about U.S. politician overallTwitterShare By David Cohen|October 16, 2019 Share Julián Castro, who served as Secretary of Housing and Urban Development under former President Barack Obama, provided the most-tweeted moment of the fourth Democratic presidential candidates’ debate Tuesday night. The most-tweeted moments during the event were: Castro saying, “Police violence is also gun violence” Former Vice President Joe Biden criticizes President Donald Trump’s Syria policy Sen. Kamala Harris (Calif.) discusses women’s access to reproductive health care The most-tweeted-about Democratic candidates Tuesday night were: Biden Sen. Elizabeth Warren (Mass.) Sen. Bernie Sanders (Vt.) Harris South Bend (Ind.) Mayor Pete Buttigieg Rep. Tulsi Gabbard (Hawaii) And the most-tweeted-about U.S. politicians overall were: Trump Biden Warren Sanders Harris Buttigieg Twitter Adweek Adweek