"Sex and the City" star and progressive activist Cynthia Nixon has prepared the paperwork required to mount a challenge to New York Governor Andrew Cuomo in the state's upcoming Democratic primary, threatening to unseat the longtime liberal stalwart if he fails to move further left.

According to Politico, the actress has been reaching out to potential campaign staffers, including two "well known" Democratic operatives, and while she has yet to officially file to run for governor, sources told the political magazine that all of the forms are filled out and the checks are written. It's only a matter of time.

Nixon's publicist did not confirm the actress's intentions on Tuesday, but said she's considering the will of the people.

"Many concerned New Yorkers have been encouraging Cynthia to run for office, and as she has said previously, she will continue to explore it,” Nixon's representative said in a statement. "If and when such a decision is made, Cynthia will be sure to make her plans public."

If she does run, it will be a challenge from the Left, something that reportedly shocked Cuomo's staff, who consider the governor one of the nation's most progressive leaders. Nixon, who is gay, is an outspoken advocate for progressive causes like LGBT rights, and holds extreme views on things like abortion and "economic justice."

And Cuomo appears to be in, at least, some danger; in 2013 he lost a third of the vote to a completely unknown progressive leader, Zephyr Teachout, and he seems so concerned about Nixon that his office is already suggesting that she lacks star power, that her name recognition is low in a state where most primary voters are "demographically attuned to ‘60 Minutes’ more than ‘Sex and the City.'"

Cuomo has also sacrificed some of his progressive agenda for practicality. The governor, according to Politico, has mostly avoided pet progressive causes like the minimum wage, fracking, public sector employee unions, and state infrastructure, but even hardcore leftists would be hard-pressed to call Cuomo a "moderate" governor.

That doesn't seem to matter much, however. Nixon, like other progressives, sees 2018 as their "Resistance" moment and they intend to reform the Democratic party, even if they don't win national elections. And that could be very dangerous for even Democratic stalwarts like Andrew Cuomo.