– Judy Gross stood outside Cuba's diplomatic mission to the United States, microphone in hand, and described her family's Thanksgiving.

"There was once again an empty seat for Alan," she told sign-wielding supporters Monday in front of the Cuban Interests Section in Washington. "That huge void, the pain, and the anguish are worse this year, as no one thought that we would be celebrating another holiday without Alan."

"Free Alan Gross now!" supporter Les Ulanow shouted.

The demonstration reflected a new approach in the long campaign to win the release of the Maryland man, who was sentenced in March to 15 years in a Cuban prison for crimes against the state.

Gross, 62, who grew up in the Baltimore area and graduated from Milford Mill High School and the University of Maryland, had taken cellphones, laptop computers and satellite communications equipment to the communist nation. The international development veteran was working on a U.S. government program aimed at improving Internet access for ordinary Cubans.

President Barack Obama has called for his release, and former President Jimmy Carter and others have appealed directly to Cuban officials during visits to the island. The U.S. Agency for International Development says it is now managing its Cuba program differently.

But as efforts of U.S. officials so far have failed, family and friends now are taking Gross' case to the public.

On the eve of the second anniversary of his arrest, Judy Gross, his wife of 41 years, is giving interviews to news reporters. Washington-area Jewish leaders have launched a weekly vigil outside the Cuban mission. Rep. Chris Van Hollen and Sen. Benjamin L. Cardin are circulating letters in Congress, and lawmakers are planning to make floor statements this week.

"We really are pushing for people to know him," Judy Gross said. "For his case to be known, and for people in the country to know that he's sitting in that jail languishing away."

The effort, which she described as "the beginning of a bigger push, locally, nationally and internationally," has the support of U.S. officials.

"We have always taken our cue from the Gross family, and we'll continue to do that," Roberta S. Jacobson, the acting assistant secretary of state for Western Hemisphere affairs, told a Senate committee this month. "But we do think that it is time to speak out very loudly."

Van Hollen, Gross' congressman, said: "We have no recourse but to ratchet up the pressure."

"The question for the Cuban government is whether they want improved relations with the United States," the Maryland Democrat said. "So long as Alan Gross remains imprisoned there, that door is closed."

Officials with the Cuban Interests Section couldn't be reached to comment on Monday. The president of the Cuban parliament said this month that the island would not free Gross unilaterally.

Judy Gross sees a growing urgency to her husband's case. Since his arrest in February 2009, the older of their two adult daughters has undergone a double mastectomy for breast cancer, and his 89-year-old mother has been diagnosed with inoperable lung cancer.

Judy Gross also has had surgery. A psychotherapist at Suburban Hospital in Bethesda, she sold the family home in Potomac last year because, she says, she couldn't make the mortgage payments without her husband's earnings. She has moved to an apartment in Washington.

Cuban authorities have allowed some communication and visits. Judy Gross last spoke with her husband on Saturday.

"Never have I heard him more hopeless and depressed," she said. "His voice was fading away as he spoke. His spirit is almost broken."

Alan Gross has worked in more than 50 countries in Africa, Asia, Latin America and the Middle East, with a focus on economic development. Family and friends describe him as jovial and passionate about helping others.