With mom by his side, Booker signs paperwork declaring candidacy for president

With mom by his side, Booker signs paperwork declaring candidacy for president

Sen. Cory BookerCory Anthony BookerBooker: Trump is 'worse than a racist' Cory Booker talks about 'geeking out' over Rosario Dawson's Marvel role Harris faces pressure to define policy proposals 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.”

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 TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller 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 SandersBernie SandersBullock: I would not have endorsed health care for undocumented immigrants on debate stage Harris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act MORE (I-Vt.), Amy KlobucharAmy Jean KlobucharDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage Protect American patients and innovation from a harmful MedTech Tax increase MORE (D-Minn.) and Michael BennetMichael Farrand BennetDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D-Colo.). Sanders is reportedly preparing to launch a campaign that he’ll announce soon. 

Also running are Rep. Tulsi GabbardTulsi GabbardHarris voices support for Puerto Rico protesters: 'I stand with them' Democrats slam Puerto Rico governor over 'shameful' comments, back protesters Gabbard arrives in Puerto Rico to 'show support' amid street protests MORE (D-Hawaii), former Rep. John DelaneyJohn Kevin DelaneyJulián Castro is behind in the polls, but he's finding a niche Democratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage 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.