Actress opposing Cuomo for governor

NEW YORK — Actress Cynthia Nixon officially jumped into the race for governor of New York on Monday, setting off what promises to be a tumultuous six months as she challenges Gov. Andrew M. Cuomo in this year’s Democratic primary.

Nixon, 51, has never before run for elected office and has chosen a huge undertaking for her first bid: seeking to unseat a two-term incumbent (and son of a three-term governor) who is sitting atop more than $30 million in campaign cash.

The contest will likely become one of the marquee Democratic primaries in the nation, as Nixon is widely expected to challenge Cuomo from the political left. Her campaign immediately cast Cuomo as a ‘‘centrist and Albany insider,’’ and some of her initial rhetoric on inequality echoed Vermont Sen. Bernie Sanders.

‘‘We are now the most unequal state in the entire country, with both incredible wealth and extreme poverty,’’ she said in a video posted on Twitter announcing her candidacy.

Nixon, best known for her work in the ‘‘Sex and the City’’ franchise, is expected to lean heavily on her star power and ability to draw media attention in ways that most traditional challengers could not.

Within 18 minutes of posting her announcement video Monday, she was the No. 1 trending topic on Twitter in New York, and then nationwide 20 minutes after that.

But her campaign may test the appetite of New Yorkers for a celebrity leader in the age of President Donald Trump, a deeply unpopular figure in New York among Democrats. While Nixon has been an education activist for many years, her fame could cut both ways in the coming months.

If elected, Nixon would become the first female governor, and the first openly gay governor, in New York history. Nixon