Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) on Friday signed the paperwork declaring his candidacy for president with his mother by his side after he announced his 2020 bid.

Matt Klapper, a senior adviser for Booker’s campaign, shared a video of the senator signing the documents while standing at a kitchen counter.

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His mother, Carolyn Booker, was next to him with a hand on his shoulder.

“Alright, here we go,” Booker said as he wrote his name. “The paperwork is signed. I am official.”

“Official for what, sir?” someone asked.

“Official for running for president,” Booker responded with a laugh.

“Can’t take it back now,” a voice behind the camera said. “Somebody grab that before he rips it up.”

Cory signs paperwork declaring his candidacy for president, his mom Carolyn by his side. pic.twitter.com/2KUXn4nUfN — Matt Klapper (@mattklapper) February 1, 2019

The video was viewed more than 113,000 times in the hours after Booker released his first campaign video on Friday.

"The history of our nation is defined by collective action; by interwoven destinies of slaves and abolitionists; of those born here and those who chose America as home; of those who took up arms to defend our country, and those who linked arms to challenge and change it," Booker said in the campaign video, walking around the community of Newark, N.J., where he previously served as mayor.

The announcement, made on the first day of Black History Month, follows months of speculation on whether Booker would join the crowded field of Democratic contenders vying to take on President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

The New Jersey Democrat, 49, is up against the more than half dozen U.S. senators who have declared they are running or are seriously considering a bid.

Sens. Elizabeth Warren (D-Mass.), Kirsten Gillibrand (D-N.Y.) and Kamala Harris (D-Calif.) have all launched campaigns.

Other senators who have indicated interest in running for the Democratic nomination in 2020 include Sens. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.), Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.) and Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.). Sanders is reportedly preparing to launch a campaign that he’ll announce soon.

Also running are Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii), 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.), former Housing and Urban Development Secretary Julián Castro and Pete Buttigieg, mayor of South Bend, Ind.

Booker, if elected, would be the first unmarried man elected to White House since 1884.