Cynthia Nixon reveals if 'Sex and the City 3' not happening pushed her to run for office (Exclusive)

Cynthia Nixon is setting the record straight on Sex and the City 3!

Just one day after the 51-year-old actress announced she was running for governor of New York, ET caught up her while she was en route to her first campaign event in Brooklyn, New York, on Tuesday. She told us exclusively that the third installment of the Sex and the City movie not happening had nothing to do with her gubernatorial bid.

"Not at all," Nixon, who portrayed Miranda Hobbes in the SATC series and movies, replied when we asked if SATC getting shelved was "the final" push. "No!"

Nixon continued on, clarifying that her decision to run was actually in the works for nearly a decade.

"This is a decision that has been a longtime coming," she explained. "People have actually been asking me to do this for nine years."

See photos of Cynthia Nixon:

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Cynthia Nixon out and about
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Cynthia Nixon out and about
NEW YORK, NY - JUNE 29: Cynthia Nixon attends the portrait unveilings of Laura Linney and Cynthia Nixon starring on Broadway in the Manhattan Theatre Club's THE LITTLE FOXES, at Sardi's on June 29, 2017 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - JUNE 11: Actress Cynthia Nixon attends the 71st Annual Tony Awards at Radio City Music Hall on June 11, 2017 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - JUNE 11: Cynthia Nixon (L) attends the 2017 Tony Awards at Radio City Music Hall on June 11, 2017 in New York City. (Photo by Kevin Mazur/Getty Images for Tony Awards Productions)
NEW YORK, NY - JUNE 4: Cynthia Nixon attends 2017 Drama Desk Awards - Arrivals at Anita's Way on June 4, 2017 in New York City. (Photo by Paul Bruinooge/Patrick McMullan via Getty Images)
NEW YORK, NY - MAY 22: Cynthia Nixon on stage at the 2017 The Lilly Awards at Playwrights Horizons on May 22, 2017 in New York City. (Photo by Walter McBride/Getty Images)
NEW YORK, NY - MAY 25: Cynthia Nixon attends the Outer Critics Circle 2016-2017 Awards at Sardi's on May 25, 2017 in New York City. (Photo by Nicholas Hunt/Getty Images)
NEW YORK, NY - MAY 25: Best Actress in a Play Winner for 'The Little Foxes' Laura Linney and Best Featured Actress in a Play Winner for 'The Little Foxes' Cynthia Nixon pose at the 2017 Outer Critics Circle Awards Presentation at Sardi's on May 25, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/FilmMagic)
NEW YORK, NY - MAY 22: Cynthia Nixon attends the 2017 Lilly Awards at Playwrights Horizons on May 22, 2017 in New York City. (Photo by Walter McBride/Getty Images)
NEW YORK, NY - MAY 19: Laura Linney and Cynthia Nixon attend the 83rd Annual Drama League Awards Ceremony at Marriott Marquis Times Square on May 19, 2017 in New York City. (Photo by Walter McBride/WireImage)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Cynthia Nixon -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 03: Cynthia Nixon and Laura Linney attend the 2017 Tony Awards Meet The Nominees Press Junket at the Sofitel Hotel on May 3, 2017 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - MAY 10: Actor Cynthia Nixon attends 2017 Drama Desk Nominees reception at Marriott Marquis Times Square on May 10, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - APRIL 21: Actress Cynthia Nixon visits the SiriusXM Studios on April 21, 2017 in New York City. (Photo by Cindy Ord/Getty Images)
NEW YORK, NY - APRIL 19: (EXCLUSIVE COVERAGE) Christine Marinoni and wife Cynthia Nixon pose at the opening night after party for Manhattan Theatre Clubs production of 'The Little Foxes' on Broadway at The Copacabana on April 19, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/FilmMagic)
NEW YORK, NY - APRIL 19: Cynthia Nixon and Laura Linney during the Broadway Opening Night Curtain Call bows for 'The Little Foxes' at Samuel J. Friedman Theatre on April 19, 2017 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - MARCH 08: Cynthia Nixon attends the 2017 Afghan Hands fundraiser at Gabriel & Co Showroom on March 8, 2017 in New York City. (Photo by Andrew Toth/Getty Images)
NEW YORK, NY - FEBRUARY 28: Cynthia Nixon attends the cast photo call for the Manhattan Theatre Club's New Broadway Production of 'The Little Foxes' at the MTC Rehearsal studios on February 27, 2017 in New York City. (Photo by Walter McBride/WireImage)
NEW YORK, NY - FEBRUARY 17: (L-R) Cynthia Nixon, Mario Cantone and Claudia Shear pose at the Opening Night Party for The New Group production of 'Evening at The Talk House' at Green Fig Urban Eatery at Yotel on February 16, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/FilmMagic)
NEW YORK, UNITED STATES - JANUARY19: American actress Cynthia Nixon gives a speech as people gather in front of Trump International Hotel & Tower in New York, USA on January 19, 2017 during a demonstration to protest US President-elect, Republican, Donald Trump ahead of his inauguration which will be held in Washington. Mayor of New York Bill de Blasio,Mayor of Minneapolis Betsy Hodges participate the protest as well as celebrities including Robert De Niro, Marisa Tomei, Sally Field, Alec Baldwin, Mark Ruffalo, Cynthia Nixon, Michael Moore, Cher, Natalie Merchant . (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
SANTA MONICA, CA - DECEMBER 11: Cynthia Nixon arrives at the The 22nd Annual Critics' Choice Awards at Barker Hangar on December 11, 2016 in Santa Monica, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - NOVEMBER 20: Actress Cynthia Nixon attends the 'Sweet Charity' Opening Night Afterparty at The Lindeman on November 20, 2016 in New York City. (Photo by J. Countess/Getty Images)
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She tells ET that, so far, she's found her biggest support within the public school community. "[My biggest supporters are] other public school parents that I was fighting alongside with for better schools," she said.

Of course, she has also found support from her family, including her three kids -- Max, Samantha and Charles -- whom she shares with her wife, Christine Marinoni.

"I think they're excited on a certain level and dreading it on another," Nixon shared. "I think they are very proud. I think they are."

Nixon will challenge Democratic Gov. Andrew Cuomo in the state's Democratic primary in September.

Reporting by Darla Murray.

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