Actress Julianna Margulies and her husband Keith Lieberthal are the latest celebrities to join the Human Rights Campaign's (HRC) New Yorkers for Marriage Equality campaign.

“We believe in traditional marriage,” Margulies says in a 30-second video released on Thursday. “It's a lifetime commitment to the person you can't imagine life without.”

“A pledge to nurture and support them, through good and bad without reservation,” Lieberthal says.

“So let's strengthen traditional marriage by letting every New Yorker embrace this commitment to the person they love,” Margulies adds. (The video is embedded in the right panel of this page.)

The 44-year-old Margulies is best know for playing nurse Carol Hathaway on the long-running NBC medical drama ER. She currently stars in CBS' legal drama The Good Wife.

Margulies and Lieberthal married in 2007. They have a 3-year-old son, Kieran Lindsay Lieberthal.

The couple is among the growing number of celebrities and prominent politicians to record a video for the campaign that began last year.

Five gay rights groups – including HRC – last week announced the formation of New Yorkers United for Marriage to begin a new push for the legalization of gay marriage in New York. The campaign will be coordinated by Governor Andrew Cuomo's office.

Recent polling shows a majority (58%) of New York voters favor giving gay and lesbian couples the right to marry.