Gillibrand welcomes Booker into 2020 race: 'I'll be cheering you on' but 'not TOO hard'

Gillibrand welcomes Booker into 2020 race: 'I'll be cheering you on' but 'not TOO hard'
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Sen. Kirsten GillibrandKirsten GillibrandMaloney primary challenger calls on her to return, donate previous campaign donations from Trump Senate confirms controversial circuit court nominee She Should Run launches initiative to expand number of women in political process MORE (D-N.Y.) welcomed fellow Democrat and friend Sen. Cory BookerCory Anthony BookerKrystal Ball issues warning to Biden supporters Sanders official predicts health care, climate change will be top issues in fifth Democratic debate 2020 Democrats seek investigation into 'toxic culture' at NBC ahead of debate MORE (N.J.) to the 2020 presidential race Friday, telling him that she would be cheering for him, "just, you know, not TOO hard."

"Congratulations and welcome to the race to one of my closest friends, @corybooker!" Gillibrand, who set up an exploratory committee earlier this year, wrote on Twitter. "I'll be cheering you on—just, you know, not TOO hard." 

Gillibrand also included a video released in January of the two playing a game called "How Well Do You Know Your Co-Worker?"

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The two are known to be good friends.

Booker responded by calling her his sister, saying that while there "may be some sibling rivalry...we will always be family." 

Booker, the former mayor of Newark, N.J., announced his candidacy earlier Friday morning, joining what is expected to be a crowded Democratic field.

Along with Gillibrand, Sens. Elizabeth WarrenElizabeth Ann Warren2020 Dems slam Trump decision on West Bank settlements Sanders doubles down on Bolivia 'coup,' few follow suit Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE (D-Mass.) and Kamala HarrisKamala Devi HarrisKamala Harris endorses Christy Smith in bid to fill Katie Hill's seat Poll: Biden holds 11-point lead over Warren in Arizona Poll: Biden and Warren are neck and neck in California MORE (D-Calif.) are also in the race.

Rep. Tulsi GabbardTulsi Gabbard2020 Dems slam Trump decision on West Bank settlements Sanders reclaims second place in new 2020 poll New poll catapults Buttigieg to frontrunner position in Iowa MORE (D-Hawaii), former Rep. John DelaneyJohn Kevin DelaneyPoll: Biden holds 20-point lead in South Carolina Deval Patrick: a short runway, but potential to get airborne Delaney to take message to Iowa voters on Sunday with infomercial MORE (D-Md.), former Housing and Urban Development Secretary Julián Castro and Pete Buttigieg, mayor of South Bend, Ind., have also entered the 2020 contest.