Cynthia Nixon has launched her campaign for the Democratic nomination, taking on incumbent Gov. Andrew Cuomo in what will likely be a national, marquee battle over the Democratic Party in New York.

“New York is my home,” Nixon says in an announcement video. “I’ve never lived anywhere else.”

She adds: “Our leaders are letting us down. We are now the most unequal state in the country.”

The video first appeared on Twitter and includes a link to a fundraising page.

Nixon is an actress best known for her role in the Sex And The City franchise, but also as an advocate for public education.

A Siena College poll released Monday showed Cuomo with a wide lead over a potential Nixon challenge, conducted before she announced her candidacy.

But she has also assembled a formidable team of experienced campaign hands with Rebecca Katz and Bill Hyers, both of whom have worked with Cuomo’s Democratic rival, New York City Mayor Bill de Blasio.

In the video, Nixon cited issues she will raise in the campaign, including education inequality, but also transit, an issue that has bedeviled Cuomo over the last year.

Cuomo has the advantages, however, of incumbency: A deep well of organized political support from organized labor unions who have backed his campaigns and issue advocacy in Albany.

At the same time, Cuomo has enjoyed steady support from Democrats and self-identified liberals.

Still, Cuomo’s troubles this year include the conviction of his former top aide, Joe Percoco, on corruption charges last week.

The announcement comes as Nixon was believed to be assembling a campaign team. In recent weeks this month, Cuomo has unspooled endorsements from figures like Elton John, while other Democrats, including Rep. Sean Patrick Maloney, urged her not to run. Cuomo has appeared at rallies with students against gun violence and promoted an early voting rally that was held by the liberal Indivisible group.

The announcement also comes as Albany is entering the thick of budget season, with a spending plan scheduled to pass by later next week.

Nixon is not the only candidate in the Democratic primary. Former state Sen Terry Gipson and comedian-activist Randy Credico have also announced their intentions to run.

Cuomo’s re-election campaign responded in a statement saying, “It’s great that we live in a democracy where anyone can run for office. Governor Cuomo has delivered more real progressive wins than any other Democrat in the country, including passing marriage equality, the strongest gun safety law in the nation, a $15 minimum wage, free college tuition, paid family leave, record setting funding for public education, expanding and protecting healthcare for our most vulnerable, and banning fracking. We look forward to building on that record as we continue to fight and deliver for New York families statewide.”