This is among the findings of a new poll commissioned by the U.S. bishops' Secretariat for Pro-Life Activities.
The United Nations in March approved a declaration urging nations to ban all forms of human cloning. A complete ban has been approved twice by the U.S. House of Representatives, and endorsed by President George Bush, but the Senate has taken no action.
The new poll shows widespread support for such a ban, cutting across all demographic categories.
Public sentiment against cloning human embryos to be destroyed in medical research remains strong. Americans oppose this practice 77% to 15%. They also oppose cloning to produce children for infertile couples, 84% to 10%, the poll found.
The questions were part of a national survey conducted by International Communications Research, which polled a weighted sample of more than 1,000 American adults by telephone on May 6-11.