updated 1/9/2007 2:39:13 PM ET 2007-01-09T19:39:13

Supporters of expanded stem cell legislation predicted victory Tuesday, saying they have a tide of public opinion to boost them and perhaps enough votes in Congress to override an expected veto from President Bush.

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The House of Representatives is expected to take up the stem-cell bill Thursday, identical to one passed last July that called for broader federal funding of embryonic stem cell research, which Bush vetoed.

Senate action is expected to follow shortly and Iowa Democrat Tom Harkin told reporters: "I predict it will pass overwhelmingly."

"We should pass the bill again and again and again until we get a president who will sign it," added California Democratic Sen. Dianne Feinstein.

Stem cell potential
Stem cells are the body's master cells, found throughout the tissue and blood. Researchers hope that stem-cell research could lead to treatments for diseases such as juvenile diabetes and cancer and to perhaps replace damaged organs.

Embryonic stem cells are one of several types of these cells, and considered potentially the most powerful. They are the most controversial source of the cells, and current federal law greatly restricts the use of taxpayer money to pay for experiments using them.

Opponents of embryonic stem cell research, including Bush, say it is unethical to experiment on human embryos, even those never destined to become a baby.

Legislative strategy
Delaware Republican Rep. Mike Castle said backers may change the bill to win more support from their fellow lawmakers by including provisions such as an oversight body and funding to encourage the adoption of frozen embryos left over at fertility clinics -- currently the main source of human embryonic stem cells.

But other backers said they are not eager to kowtow to a White House that has refused to meet with them.

"I frankly see no need to change the bill with the hopes that the president might accept it," said Colorado Democratic Rep. Diana DeGette. "We have the momentum, we have the votes, we have the support of the public."

Pennsylvania Republican Sen. Arlen Specter, who has repeatedly expressed outrage that Bush will not support the expanded use of federal funds for human embryonic stem cell research, said he was "confident" it would pass the Senate with enough votes to override any White House veto.

"There ought to be a million-person march on the Mall... that can be heard in the living quarters of the White House," he said.

DeGette was less certain the votes in the House could be enough to override a veto.

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