WASHINGTON — Groups opposing Cuba's communist regime have dramatically shifted funding toward the US Democrats since the party took control of Congress in last year's elections, according to a study published on Monday.

Seventy-six percent of funding from anti-Castro political action committees in the last 12 months was channeled to Democrats and just 24 percent to Republicans -- who have long been seen as the anti-Castro party.

The study carried out by Public Campaign, an organization that campaigns against interest groups skewing the political debate through donations, said a total of 10 million dollars was funneled from anti-Castro groups since 2004.

In 2004 Republicans received 71 percent of that so-called PAC money.

"Now that Democrats control the agenda, the PAC has dramatically shifted its strategy to develop relationships with Democratic members," said Public Campaign.

The 53 Democratic legislators who earlier this year signed a letter against lifting the 47-year-old economic embargo against Cuba where among the beneficiaries, receiving 510,000 dollars from one organization.

But it is not just Congress' anti-Castro stalwarts who have come under Public Campaign's scrutiny.

"It is a group of at least 18 House members whose positions have changed since 2004 on matters related to Cuba that attracted our curiosity," the group said.

They pointed to North Carolina Democrat Mike McIntyre, who is alleged to have consistently voted for measures lifting the embargo until 2004, when he received the first tranche of a total 14,500 dollars from anti-Castro groups.

Public Campaign based their study on data on donations of over 1,000 dollars which are required by law to be made public.